US3849315A - Film-forming fire fighting composition - Google Patents
Film-forming fire fighting composition Download PDFInfo
- Publication number
- US3849315A US3849315A US00254404A US25440472A US3849315A US 3849315 A US3849315 A US 3849315A US 00254404 A US00254404 A US 00254404A US 25440472 A US25440472 A US 25440472A US 3849315 A US3849315 A US 3849315A
- Authority
- US
- United States
- Prior art keywords
- liquid
- fire
- fighting
- percent
- foamability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
- A62D1/0071—Foams
- A62D1/0085—Foams containing perfluoroalkyl-terminated surfactant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S516/00—Colloid systems and wetting agents; subcombinations thereof; processes of
- Y10S516/905—Agent composition per se for colloid system making or stabilizing, e.g. foaming, emulsifying, dispersing, or gelling
- Y10S516/906—The agent contains organic compound containing silicon
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S516/00—Colloid systems and wetting agents; subcombinations thereof; processes of
- Y10S516/905—Agent composition per se for colloid system making or stabilizing, e.g. foaming, emulsifying, dispersing, or gelling
- Y10S516/914—The agent contains organic compound containing nitrogen, except if present solely as NH4+
Definitions
- ABSTRACT Aqueous foam film-forming fire fighting compositions based on mixtures of fluorocarbon and siloxane surfactants, are improved for sub-surface introduction into burning hydrophobic liquids by the addition of a different surfactant that increases foamability and has a hydrophilic moiety weighing at least 80 percent more than its lipophilic moiety.
- the present invention relates to fire fighting, and particularly to the use of film-formingcompositions in the fighting of fires.
- aqueous film-forming liquid containing dissolved fluorocarbon and silicone surfactants in amounts that give the liquid a surface tension at least as low as 19 dynes per centimeter but do not give it good foamability
- improvement is made pursuant to the present invention by having the liquid also contain a different surfactant that has a hydrophilic moiety whose weight is at least 80 percent greater and more desirably at least 120 percent greater than its lipophilic moiety, and is contained in an amount at least about 40 percent of that which provides good foamability to the liquid.
- Preferred lipophilic moieties for the last mentioned surfactant are hydrocarbon chains not over 10 carbons long, or betterstill only 7 0r 8 carbons long. Also the best hydrophilic moieties contain at least 3 hydrophile units such as hydroxyl, carboxyl, sulfo and nitrogen. Particularly effective surfactants are those of the imidazoline type containing a quaternized nitrogen hydroxide carrying two short carboxylated chains. Others falling within the foregoing definition and providing very good results include disodium n-octyl amine dipropionate.
- a feature of the present invention is that the firefighting foams thus produced are very effective for extinguishing fires in burning hydrophobic liquids by introducing the foam into the burning liquid below the liquids surface.
- Such sub-surface introduction is a particularly desirable technique for fighting fires in storage tanks, for example, inasmuch as less vulnerable and less expensive foam-supplying installations can be used.
- the fire-fighting composition of the present invention can also contain other ingredients such as antifreeze agents, hydrophilic resins, buffers, sequestering agents such as those for the cations of sea water, preservatives, the acetylene glycols of Ser. No. 131,763, etc.
- the new composition can also be prepared from concentrates which are diluted with tap or sea water when needed to be applied to a'fire.
- the foregoing ingredients are mixed in any order and the final product is a so-called 6 percent fire-fighting concentrate. It can be stored for many months, and is used for fire-fighting by mixing it with 16% times its volume of water and also with sufficient air to foam with an expension of 3 to 6. This expansion is generally considered adequate for fire fighting.
- Such mixing is conveniently effected with a high-back-pressure venturi as shown in US. Pat. No. 3,475,333 granted Oct. 28, 1969, for sub-surface introduction into the usual types of storage tanks.
- This mixture can be used interchangeably with that of Example I, but by reason of the sequestering action of the nitrilotriacetate it works better than that of Example I when diluted with sea water.
- the silicone surfactant is somewhat more stable in a solution that contains isopropyl alcohol. It is accordingly helpful to increase the amount of isopropyl alcohol in the 6 percent concentrates of Examples I and II. As much as percent by weight isopropyl alcohol can thus be present in those concentrates. Larger concentrations are undesirable inasmuch as they tend to unduly lower the flash point of the concentrates.
- the silicone surfactants are also more stable if kept from acid media and as in Ser. No. l3l,763 a pH of about 7.8 is preferred for the concentrates of the present invention.
- the tris hydroxymethylamino methane helps buffer the concentrates of the foregoing Examples at about that pH, even when they are mixed with other concentrates that are acid.
- fluorocarbon surfactants disclosed in Ser. No. 131,763 can be used in place of those of Examples l and Il.
- Other anionic, cationic or amphoteric fluocarbon surfactants such as those shown to be effective in U.S. Pat. No. 3,655,555, granted Apr. ll, 1972, can also be so used.
- any of the silicone surfactants of that prior application can be used in place of those of Examples l and II.
- a fungicide such as formaldehyde or the sodium salt of o-phenyl-phenol can also be added to the concentrates to inhibit mold growth and the like.
- the concentrates of the present invention can also be prepared for dilution in proportions other than the 1655:] ratio given above. Another widely used dilution ratio is 33 18:] and for such use the concentrates can be prepared to have double the strength shown in Examples I and II. Other dilutions take correspondingly modified concentrates, although it is not necessary to accurately proportion the dilution. As much as a plus or minus 50 percent departure from the target dilution proportion can be tolerated. One reason for such tolerance is that the fire-fighting effectiveness of the diluted mixtures is not dependent to any significant degree on good foaming. Even a foam of the present invention with an expansion of 2 will do a good job of rapidly extinguishing a gasoline fire by subsurface introduction.
- the imidazoline surfactant is so effective that it is diluted with more than an equal amount of less effective surfactant composition outside the scope of the present invention. That example can be substantially improved by replacing the less effective surfactant composition by an additional quantity of the imidazoline surfactant of Examples I or ,II, or any other imidazoline surfactant such as
- the long unsubstituted alkyl chain of 7 to 9 carbons is the lipophilic moiety.
- the balance of the molecule is the hydrophilic moiety and contains a multiplicity of hydrophile units.
- the quaternary hydroxylated nitrogen is one such unit, the other nitrogen is a second, and the alcohol, carboxy and sulfo groups are additional ones.
- a chain of two carbons will not detract from the hydrophilic character even if such chain is fully hydrogenated and also carries a methyl branch. Oxygen or nitrogens should therefore interrupt carbon chains to leave chain lengths not more than two carbons long.
- the two carbons connected together in the imidazoline ring are counted as part of the hydrophilic moiety, as is the CH CH OCH portion of the imidazoline of Example 1.
- the ring carbon to which the lipophilic moiety is connected has two nitrogens also directly connected to it and for that reason is considered part of the hydrophilic moiety.
- n-octyl amine di-propionic acid e.g., C H, N(CH CH COONa) or the corresponding salts of n-octyl amine di-2-methyl propionic acid although they are somewhat less effective. Because of the prohibitive expense it is impractical to use a fluorocarbon or siloxane type surfactant as a foamabilityimproving material.
- aqueous film-forming fire-fighting foamable liquid containing dissolved fluorocarbon and silicone surfactants in amounts that give the liquid a surface tension at least as low as 19 dynes per centimeter but do not give it good foamability and also containing one or more foamability-increasing surfactants that are neither fluorocarbons nor silicones, to bring the foamability of the liquid up to the level needed for a fire-fighting foam
- the improvement according to which at least 40 percent of the foamability-increasing surfactants is an imidazoline or amine di-propionate surfactant with hydrophilic and lipophilic moieties of which the hydrophilic moiety has at least three hydrophile units selected from the class consisting of hydroxyl, carboxyl, sulfo and nitrogen, and weighs at least 80 percent more than the lipophilic moiety.
- R is a C to C alkyl
- the amine dipropionate surfactant is C H N(CH CH COONa) or '6.
Abstract
Description
Claims (7)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00254404A US3849315A (en) | 1972-05-18 | 1972-05-18 | Film-forming fire fighting composition |
JP47086735A JPS5233920B2 (en) | 1972-05-18 | 1972-08-31 | |
AU55172/73A AU470208B2 (en) | 1972-05-18 | 1973-05-03 | Film-forming firefighting composition |
GB2354873A GB1431982A (en) | 1972-05-18 | 1973-05-17 | Film-forming firefighting composition |
CA171,787A CA994539A (en) | 1972-05-18 | 1973-05-18 | Film-forming fire fighting composition |
US05/525,175 US4038195A (en) | 1972-05-18 | 1974-11-19 | Fire fighting compositions |
US05/670,252 US4060489A (en) | 1971-04-06 | 1976-03-25 | Fire fighting with thixotropic foam |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00254404A US3849315A (en) | 1972-05-18 | 1972-05-18 | Film-forming fire fighting composition |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13176371A Continuation-In-Part | 1971-04-06 | 1971-04-06 |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US30747972A Continuation-In-Part | 1972-11-17 | 1972-11-17 | |
US05/369,584 Continuation-In-Part US3957657A (en) | 1971-04-06 | 1973-06-13 | Fire fighting |
US05/525,175 Continuation-In-Part US4038195A (en) | 1972-05-18 | 1974-11-19 | Fire fighting compositions |
Publications (1)
Publication Number | Publication Date |
---|---|
US3849315A true US3849315A (en) | 1974-11-19 |
Family
ID=22964185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00254404A Expired - Lifetime US3849315A (en) | 1971-04-06 | 1972-05-18 | Film-forming fire fighting composition |
Country Status (5)
Country | Link |
---|---|
US (1) | US3849315A (en) |
JP (1) | JPS5233920B2 (en) |
AU (1) | AU470208B2 (en) |
CA (1) | CA994539A (en) |
GB (1) | GB1431982A (en) |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3957658A (en) * | 1971-04-06 | 1976-05-18 | Philadelphia Suburban Corporation | Fire fighting |
US4038195A (en) * | 1972-05-18 | 1977-07-26 | Philadelphia Suburban Corporation | Fire fighting compositions |
US4042522A (en) * | 1975-03-24 | 1977-08-16 | Ciba-Geigy Corporation | Aqueous wetting and film forming compositions |
US4060132A (en) * | 1974-11-19 | 1977-11-29 | Philadelphia Suburban Corporation | Fire fighting with thixotropic foam |
US4060489A (en) * | 1971-04-06 | 1977-11-29 | Philadelphia Suburban Corporation | Fire fighting with thixotropic foam |
US4149599A (en) * | 1976-03-25 | 1979-04-17 | Philadelphia Suburban Corporation | Fighting fire |
US4390069A (en) * | 1979-10-01 | 1983-06-28 | Grumman Aerospace Corporation | Trifluorobromomethane foam fire fighting system |
US4859349A (en) * | 1987-10-09 | 1989-08-22 | Ciba-Geigy Corporation | Polysaccharide/perfluoroalkyl complexes |
US5945025A (en) * | 1997-12-08 | 1999-08-31 | Cunningham; James A. | Fire extinguishing composition and method for fire extinguishing |
US6231778B1 (en) | 1999-12-29 | 2001-05-15 | Ansul Incorporated | Aqueous foaming fire extinguishing composition |
US6550750B1 (en) | 1997-05-09 | 2003-04-22 | David Kalkstein | Apparatus for producing foamable compositions and other compositions |
US20070085060A1 (en) * | 2005-10-18 | 2007-04-19 | Dario Santoro | Method of making a fire extinguishing chemical |
US20080146820A1 (en) * | 2006-12-15 | 2008-06-19 | Axel Hans-Joachim Herzog | Phosphate fluorosurfactant and siloxane surfactant |
EP1980611A2 (en) | 2007-04-10 | 2008-10-15 | Evonik Goldschmidt GmbH | Use of anionic silicon tensides for creating foam |
EP1980295A2 (en) | 2007-04-10 | 2008-10-15 | Evonik Goldschmidt GmbH | Silicon tenside compounds and their use for producing foam |
DE102008000845A1 (en) | 2008-03-27 | 2009-10-01 | Evonik Goldschmidt Gmbh | Use of a composition containing silicon organic compounds and optionally surfactant active compounds with perfluorinated units, to produce fire-extinguishing foam, which is useful to clean device or apparatus, and reduce evaporation loss |
DE102008054712A1 (en) | 2008-12-16 | 2010-06-17 | Evonik Goldschmidt Gmbh | Use of amphoteric surfactants to produce foam |
US7964552B2 (en) | 2006-12-15 | 2011-06-21 | E. I. Du Pont De Nemours And Company | Fluorosurfactant with disproportionate effect |
WO2012045080A1 (en) | 2010-10-01 | 2012-04-05 | Tyco Fire Products Lp | Aqueous fire-fighting foams with reduced fluorine content |
US8628682B2 (en) | 2011-10-24 | 2014-01-14 | E I Du Pont De Nemours And Company | Compositions comprising a fluorosurfactant and a hydrotrope |
WO2014144988A2 (en) | 2013-03-15 | 2014-09-18 | Tyco Fire Products Lp | Perfluoroalkyl composition with reduced chain length |
WO2014153140A1 (en) | 2013-03-14 | 2014-09-25 | Tyco Fire & Security Gmbh | Trimethylglycine as a freeze suppressant in fire fighting foams |
WO2016130810A1 (en) | 2015-02-13 | 2016-08-18 | Tyco Fire Products Lp | Use of an indicator as a marker in foam concentrates |
WO2017161156A1 (en) | 2016-03-18 | 2017-09-21 | Tyco Fire Products Lp | Polyorganosiloxane compounds as active ingredients in fluorine free fire suppression foams |
WO2017161162A1 (en) | 2016-03-18 | 2017-09-21 | Tyco Fire Products Lp | Organosiloxane compounds as active ingredients in fluorine free fire suppression foams |
WO2018022763A1 (en) | 2016-07-29 | 2018-02-01 | Tyco Fire Products Lp | Firefighting foam compositions containing deep eutectic solvents |
US10870030B2 (en) | 2014-04-02 | 2020-12-22 | Tyco Fire Products Lp | Fire extinguishing compositions and method |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51108788A (en) * | 1975-03-20 | 1976-09-27 | Kogyo Gijutsuin | |
JPS51117589A (en) * | 1975-04-09 | 1976-10-15 | Agency Of Ind Science & Technol | Glass sealed solar battery equipment and its manufacturing method |
JPS5836251Y2 (en) * | 1977-05-25 | 1983-08-16 | ヤンマー農機株式会社 | Reaping conveyance device in combine harvester |
JP4678338B2 (en) * | 2006-06-06 | 2011-04-27 | 信越化学工業株式会社 | Organic resin flame retardant additive, flame retardant resin composition and molded product thereof |
CN105854216B (en) * | 2016-04-01 | 2019-02-05 | 中国民用航空飞行学院 | Aqueous film-forming foam extinguishing agent based on short carbon fluorine chain |
CN110935392B (en) * | 2019-11-26 | 2022-02-15 | 沈阳建筑大学 | Anti-freezing organic foaming liquid for foam-blocked environment-friendly toilet and preparation method thereof |
-
1972
- 1972-05-18 US US00254404A patent/US3849315A/en not_active Expired - Lifetime
- 1972-08-31 JP JP47086735A patent/JPS5233920B2/ja not_active Expired
-
1973
- 1973-05-03 AU AU55172/73A patent/AU470208B2/en not_active Expired
- 1973-05-17 GB GB2354873A patent/GB1431982A/en not_active Expired
- 1973-05-18 CA CA171,787A patent/CA994539A/en not_active Expired
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4060489A (en) * | 1971-04-06 | 1977-11-29 | Philadelphia Suburban Corporation | Fire fighting with thixotropic foam |
US3957658A (en) * | 1971-04-06 | 1976-05-18 | Philadelphia Suburban Corporation | Fire fighting |
US4038195A (en) * | 1972-05-18 | 1977-07-26 | Philadelphia Suburban Corporation | Fire fighting compositions |
US4060132A (en) * | 1974-11-19 | 1977-11-29 | Philadelphia Suburban Corporation | Fire fighting with thixotropic foam |
US4042522A (en) * | 1975-03-24 | 1977-08-16 | Ciba-Geigy Corporation | Aqueous wetting and film forming compositions |
US4149599A (en) * | 1976-03-25 | 1979-04-17 | Philadelphia Suburban Corporation | Fighting fire |
US4390069A (en) * | 1979-10-01 | 1983-06-28 | Grumman Aerospace Corporation | Trifluorobromomethane foam fire fighting system |
US4859349A (en) * | 1987-10-09 | 1989-08-22 | Ciba-Geigy Corporation | Polysaccharide/perfluoroalkyl complexes |
US6550750B1 (en) | 1997-05-09 | 2003-04-22 | David Kalkstein | Apparatus for producing foamable compositions and other compositions |
US5945025A (en) * | 1997-12-08 | 1999-08-31 | Cunningham; James A. | Fire extinguishing composition and method for fire extinguishing |
US6231778B1 (en) | 1999-12-29 | 2001-05-15 | Ansul Incorporated | Aqueous foaming fire extinguishing composition |
US20070085060A1 (en) * | 2005-10-18 | 2007-04-19 | Dario Santoro | Method of making a fire extinguishing chemical |
US20080146820A1 (en) * | 2006-12-15 | 2008-06-19 | Axel Hans-Joachim Herzog | Phosphate fluorosurfactant and siloxane surfactant |
US7964552B2 (en) | 2006-12-15 | 2011-06-21 | E. I. Du Pont De Nemours And Company | Fluorosurfactant with disproportionate effect |
EP1980611A2 (en) | 2007-04-10 | 2008-10-15 | Evonik Goldschmidt GmbH | Use of anionic silicon tensides for creating foam |
EP1980295A2 (en) | 2007-04-10 | 2008-10-15 | Evonik Goldschmidt GmbH | Silicon tenside compounds and their use for producing foam |
DE102007016966A1 (en) | 2007-04-10 | 2008-10-16 | Evonik Goldschmidt Gmbh | Silicone surfactant compositions and their use for producing foam |
DE102007016965A1 (en) | 2007-04-10 | 2008-10-16 | Evonik Goldschmidt Gmbh | Use of anionic silicone surfactants to produce foam |
DE102008000845A1 (en) | 2008-03-27 | 2009-10-01 | Evonik Goldschmidt Gmbh | Use of a composition containing silicon organic compounds and optionally surfactant active compounds with perfluorinated units, to produce fire-extinguishing foam, which is useful to clean device or apparatus, and reduce evaporation loss |
DE102008054712A1 (en) | 2008-12-16 | 2010-06-17 | Evonik Goldschmidt Gmbh | Use of amphoteric surfactants to produce foam |
EP2198932A2 (en) | 2008-12-16 | 2010-06-23 | Evonik Goldschmidt GmbH | Use of amphoteric tensides for creating foam |
WO2012045080A1 (en) | 2010-10-01 | 2012-04-05 | Tyco Fire Products Lp | Aqueous fire-fighting foams with reduced fluorine content |
US8628682B2 (en) | 2011-10-24 | 2014-01-14 | E I Du Pont De Nemours And Company | Compositions comprising a fluorosurfactant and a hydrotrope |
US10369395B2 (en) | 2013-03-14 | 2019-08-06 | Tyco Fire Products Lp | Trimethylglycine as a freeze suppressant in fire fighting foams |
WO2014153140A1 (en) | 2013-03-14 | 2014-09-25 | Tyco Fire & Security Gmbh | Trimethylglycine as a freeze suppressant in fire fighting foams |
WO2014144988A2 (en) | 2013-03-15 | 2014-09-18 | Tyco Fire Products Lp | Perfluoroalkyl composition with reduced chain length |
US10870030B2 (en) | 2014-04-02 | 2020-12-22 | Tyco Fire Products Lp | Fire extinguishing compositions and method |
US11305143B2 (en) | 2014-04-02 | 2022-04-19 | Tyco Fire Products Lp | Fire extinguishing compositions and method |
US11766582B2 (en) | 2014-04-02 | 2023-09-26 | Tyco Fire Products Lp | Fire extinguishing compositions and method |
US10786696B2 (en) | 2015-02-13 | 2020-09-29 | Tyco Fire Products Lp | Use of an indicator as a marker in foam concentrates |
WO2016130810A1 (en) | 2015-02-13 | 2016-08-18 | Tyco Fire Products Lp | Use of an indicator as a marker in foam concentrates |
WO2017161162A1 (en) | 2016-03-18 | 2017-09-21 | Tyco Fire Products Lp | Organosiloxane compounds as active ingredients in fluorine free fire suppression foams |
WO2017161156A1 (en) | 2016-03-18 | 2017-09-21 | Tyco Fire Products Lp | Polyorganosiloxane compounds as active ingredients in fluorine free fire suppression foams |
US10780305B2 (en) | 2016-03-18 | 2020-09-22 | Tyco Fire Products Lp | Organosiloxane compounds as active ingredients in fluorine free fire suppression foams |
US11173334B2 (en) | 2016-03-18 | 2021-11-16 | Tyco Fire Products Lp | Polyorganosiloxane compounds as active ingredients in fluorine free fire suppression foams |
WO2018022763A1 (en) | 2016-07-29 | 2018-02-01 | Tyco Fire Products Lp | Firefighting foam compositions containing deep eutectic solvents |
US11771938B2 (en) | 2016-07-29 | 2023-10-03 | Tyco Fire Products Lp | Firefighting foam compositions containing deep eutectic solvents |
Also Published As
Publication number | Publication date |
---|---|
CA994539A (en) | 1976-08-10 |
GB1431982A (en) | 1976-04-14 |
JPS5233920B2 (en) | 1977-08-31 |
AU470208B2 (en) | 1976-03-04 |
AU5517273A (en) | 1974-11-07 |
JPS4925796A (en) | 1974-03-07 |
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Legal Events
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AS | Assignment |
Owner name: ENTERRA CORPORATION; 150 GORDON DR., LIONVILLE, PA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PHILADELPHIA SUBURBAN CORPORATION;REEL/FRAME:003985/0216 Effective date: 19820211 Owner name: ENTERRA CORPORATION, PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PHILADELPHIA SUBURBAN CORPORATION;REEL/FRAME:003985/0216 Effective date: 19820211 |
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AS | Assignment |
Owner name: NATIONAL FOAM SYSTEM, INC., LIONVILLE, PA A CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ENTERRA CORPORATION;REEL/FRAME:004760/0317 Effective date: 19870610 Owner name: NATIONAL FOAM SYSTEM, INC.,PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ENTERRA CORPORATION;REEL/FRAME:004760/0317 Effective date: 19870610 |
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Owner name: CHUBB NATIONAL FOAM, INC. Free format text: CHANGE OF NAME;ASSIGNOR:NATIONAL FOAM SYSTEM, INC.;REEL/FRAME:004996/0651 Effective date: 19880531 |
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AS | Assignment |
Owner name: CHUBB NATIONAL FOAM, INC. Free format text: CHANGE OF NAME;ASSIGNOR:NATIONAL FOAM SYSTEM, INC.;REEL/FRAME:005113/0652 Effective date: 19880502 |
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STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |
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Owner name: NATIONAL FOAM SYSTEM, INC., LIONVILLE, PA A PA COR Free format text: RECORD TO DELETE PATENT NUMBERS ERRONEOUSLY LISTED ON;ASSIGNOR:ENTERRA CORPORATION;REEL/FRAME:005521/0463 Effective date: 19901003 |