US3799883A - Production of high purity fission product molybdenum-99 - Google Patents
Production of high purity fission product molybdenum-99 Download PDFInfo
- Publication number
- US3799883A US3799883A US00158396A US15839671A US3799883A US 3799883 A US3799883 A US 3799883A US 00158396 A US00158396 A US 00158396A US 15839671 A US15839671 A US 15839671A US 3799883 A US3799883 A US 3799883A
- Authority
- US
- United States
- Prior art keywords
- molybdenum
- solution
- uranium
- target
- fission product
- 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
Images
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
- G21G1/00—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes
- G21G1/04—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes outside nuclear reactors or particle accelerators
- G21G1/06—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes outside nuclear reactors or particle accelerators by neutron irradiation
- G21G1/08—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes outside nuclear reactors or particle accelerators by neutron irradiation accompanied by nuclear fission
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G39/00—Compounds of molybdenum
- C01G39/003—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
Abstract
Description
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00158396A US3799883A (en) | 1971-06-30 | 1971-06-30 | Production of high purity fission product molybdenum-99 |
CA142,933A CA969373A (en) | 1971-06-30 | 1972-05-25 | Production of high purity fission product molybdenum-99 |
FR7223546A FR2157781B1 (en) | 1971-06-30 | 1972-06-29 | |
NLAANVRAGE7209050,A NL172495C (en) | 1971-06-30 | 1972-06-29 | PROCESS FOR PREPARING VERY PURE RADIOACTIVE MOLYBDENE-99. |
IL39793A IL39793A (en) | 1971-06-30 | 1972-06-29 | Process for the preparation of radioactive molybdenum-99 |
BE785637A BE785637A (en) | 1971-06-30 | 1972-06-29 | PROCESS FOR PREPARING RADIOACTIVE MOLYBDENE-99 |
DE2231976A DE2231976C3 (en) | 1971-06-30 | 1972-06-29 | Process for the production of high-purity, radioactive molybdenum-99 cleavage product |
GB3050772A GB1389905A (en) | 1971-06-30 | 1972-06-29 | Production of high purity fission product molybdenum-99 |
JP47064558A JPS517800B1 (en) | 1971-06-30 | 1972-06-29 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00158396A US3799883A (en) | 1971-06-30 | 1971-06-30 | Production of high purity fission product molybdenum-99 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3799883A true US3799883A (en) | 1974-03-26 |
Family
ID=22567913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00158396A Expired - Lifetime US3799883A (en) | 1971-06-30 | 1971-06-30 | Production of high purity fission product molybdenum-99 |
Country Status (9)
Country | Link |
---|---|
US (1) | US3799883A (en) |
JP (1) | JPS517800B1 (en) |
BE (1) | BE785637A (en) |
CA (1) | CA969373A (en) |
DE (1) | DE2231976C3 (en) |
FR (1) | FR2157781B1 (en) |
GB (1) | GB1389905A (en) |
IL (1) | IL39793A (en) |
NL (1) | NL172495C (en) |
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4010109A (en) * | 1973-07-02 | 1977-03-01 | Kurt Sauerwein | Device for marking fluent materials |
US4093697A (en) * | 1976-03-16 | 1978-06-06 | Gesellschaft Fur Kernforschung M.B.H. | Process for recovering molybdenum-99 from a matrix containing neutron irradiated fissionable materials and fission products |
US4123497A (en) * | 1975-03-06 | 1978-10-31 | The Radiochemical Centre Limited | Purification of Technetium-99m pertechnetate solutions |
US4199551A (en) * | 1978-01-13 | 1980-04-22 | Amax Inc. | Recovery of molybdenum and uranium from activated charcoal containing molybdenum and residual uranium |
US4701308A (en) * | 1984-12-28 | 1987-10-20 | Commissariat A L'energie Atomique | Process for the recovery of molybdenum-99 from an irradiated uranium alloy target |
AU582659B2 (en) * | 1985-06-13 | 1989-04-06 | Comurhex Societe Pour La Conversion De L'uranium En Metal Et Hexafluorure | Process for separation by precipitation of the molybdenum contained in sulphuric or nitric solutions of uranium |
US4839133A (en) * | 1987-10-26 | 1989-06-13 | The United States Of America As Represented By The Department Of Energy | Target and method for the production of fission product molybdenum-99 |
US4935373A (en) * | 1979-06-28 | 1990-06-19 | Radiometer A/S | Reference liquid |
US4981658A (en) * | 1986-05-15 | 1991-01-01 | Kernforschungezentrum Karlsruhe Gmbh | Process for the fine purification of fissionable molybdenum |
US5802439A (en) * | 1997-02-19 | 1998-09-01 | Lockheed Martin Idaho Technologies Company | Method for the production of 99m Tc compositions from 99 Mo-containing materials |
US5802438A (en) * | 1997-02-19 | 1998-09-01 | Lockheed Martin Idaho Technologies Company | Method for generating a crystalline 99 MoO3 product and the isolation 99m Tc compositions therefrom |
US20020080907A1 (en) * | 2000-09-28 | 2002-06-27 | Carlo Rubbia | Method and device for heating gas from a thin layer of nuclear fuel, and space engine using such method |
US20090060812A1 (en) * | 2004-08-02 | 2009-03-05 | Schenter Robert E | Medical radioisotopes and methods for producing the same |
US20090196390A1 (en) * | 2008-02-05 | 2009-08-06 | The Curators Of The University Of Missouri | Radioisotope production and treatment of solution of target material |
US20100066374A1 (en) * | 2006-10-03 | 2010-03-18 | Trygstad W Marcus | Sample analyzer and sampling system |
US20100169134A1 (en) * | 2008-12-31 | 2010-07-01 | Microsoft Corporation | Fostering enterprise relationships |
US20110206579A1 (en) * | 2010-02-19 | 2011-08-25 | Glenn Daniel E | Method and apparatus for the extraction and processing of molybdenum-99 |
US20110250107A1 (en) * | 2010-04-07 | 2011-10-13 | Jennifer Varnedoe | Column geometry to maximize elution efficiencies for molybdenum-99 |
EP2398023A1 (en) | 2010-06-21 | 2011-12-21 | The European Union, represented by the European Commission | Production of molybdenum-99 |
WO2012018752A1 (en) * | 2010-08-04 | 2012-02-09 | Mallinckrodt Llc | Purification process |
DE102011002265A1 (en) * | 2011-04-26 | 2012-10-31 | Technische Universität München | Process for the preparation of starting material for a technetium generator |
US20130136221A1 (en) * | 2011-11-14 | 2013-05-30 | Japan Atomic Energy Agency | Method of producing radioactive molybdenum |
US8666015B2 (en) | 2001-05-08 | 2014-03-04 | The Curators Of The University Of Missouri | Method and apparatus for generating thermal neutrons using an electron accelerator |
US20140140462A1 (en) * | 2011-07-13 | 2014-05-22 | Luis A.M.M. Barbosa | Process |
US20140153684A1 (en) * | 2012-12-03 | 2014-06-05 | Wisconsin Alumni Research Foundation | Dry Phase Reactor for Generating Medical Isotopes |
WO2014137439A2 (en) | 2013-02-13 | 2014-09-12 | Battelle Memorial Institute | Nuclear reactor target assemblies, nuclear reactor configurations, and methods for producing isotopes, modifying materials within target material, and/or characterizing meaterial within a target material |
US9691511B1 (en) * | 2009-11-09 | 2017-06-27 | Sandia Corporation | Target-fueled nuclear reactor for medical isotope production |
US9793023B2 (en) | 2013-09-26 | 2017-10-17 | Los Alamos National Security, Llc | Recovery of uranium from an irradiated solid target after removal of molybdenum-99 produced from the irradiated target |
US9842664B2 (en) | 2013-09-26 | 2017-12-12 | Los Alamos National Security, Llc | Recovering and recycling uranium used for production of molybdenum-99 |
CN109285616A (en) * | 2018-11-16 | 2019-01-29 | 中国原子能科学研究院 | From235It is extracted in U fission product99The device of Mo and utilization device extraction99The method of Mo |
US10734126B2 (en) * | 2011-04-28 | 2020-08-04 | SHINE Medical Technologies, LLC | Methods of separating medical isotopes from uranium solutions |
US10978214B2 (en) | 2010-01-28 | 2021-04-13 | SHINE Medical Technologies, LLC | Segmented reaction chamber for radioisotope production |
WO2021211870A3 (en) * | 2020-04-16 | 2021-11-18 | Uchicago Argonne, Llc | Technetium-99m generator for enriched molybdenum |
WO2022005882A3 (en) * | 2020-06-30 | 2022-04-07 | Uchicago Argonne, Llc | System and method for producing molybdenum 99 |
EP3985686A1 (en) | 2020-10-14 | 2022-04-20 | Narodowe Centrum Badan Jadrowych | Method of preparation of the uranium target for the production of molybdenum, molybdenum production process and the uranium target for the production of molybdenum |
US11361873B2 (en) | 2012-04-05 | 2022-06-14 | Shine Technologies, Llc | Aqueous assembly and control method |
US11830637B2 (en) * | 2008-05-02 | 2023-11-28 | Shine Technologies, Llc | Device and method for producing medical isotopes |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2610948C3 (en) * | 1976-03-16 | 1980-01-10 | Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe | Process for the extraction of molybdenum -99 from a matrix containing fissile substances and fission products irradiated with neutrons |
JPS5525844U (en) * | 1978-08-10 | 1980-02-19 | ||
FR2531060B1 (en) * | 1982-07-28 | 1986-07-04 | Cogema | PROCESS FOR RECOVERING MOLYBDENE FROM ACTIVE CARBON FROM AN ACID URANIFEROUS SOLUTION CONTAINING MORE MOLYBDENE THAN URANIUM |
US4659477A (en) * | 1982-08-16 | 1987-04-21 | Pedro B. Macedo | Fixation of anionic materials with a complexing agent |
JPS59114881U (en) * | 1983-01-24 | 1984-08-03 | 株式会社貝印刃物開発センター | pod support structure |
EP0779628A3 (en) * | 1995-12-11 | 1997-07-09 | Institut National des Radioéléments, Nationaal Instituut voor Radio-elementen | Method of stabilizing an aqueous solution of 99Mo molybdate |
RU2489501C1 (en) * | 2011-12-01 | 2013-08-10 | Общество с ограниченной ответственностью "Прайм-Инвест" | COMPOSITION OF EXTRACTION-CHROMATOGRAPHIC MATERIAL FOR SELECTIVE EXTRACTION OF Mo-99 FROM IRRADIATED URANIUM FUEL |
-
1971
- 1971-06-30 US US00158396A patent/US3799883A/en not_active Expired - Lifetime
-
1972
- 1972-05-25 CA CA142,933A patent/CA969373A/en not_active Expired
- 1972-06-29 GB GB3050772A patent/GB1389905A/en not_active Expired
- 1972-06-29 IL IL39793A patent/IL39793A/en unknown
- 1972-06-29 DE DE2231976A patent/DE2231976C3/en not_active Expired
- 1972-06-29 JP JP47064558A patent/JPS517800B1/ja active Pending
- 1972-06-29 BE BE785637A patent/BE785637A/en not_active IP Right Cessation
- 1972-06-29 FR FR7223546A patent/FR2157781B1/fr not_active Expired
- 1972-06-29 NL NLAANVRAGE7209050,A patent/NL172495C/en not_active IP Right Cessation
Cited By (59)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4010109A (en) * | 1973-07-02 | 1977-03-01 | Kurt Sauerwein | Device for marking fluent materials |
US4123497A (en) * | 1975-03-06 | 1978-10-31 | The Radiochemical Centre Limited | Purification of Technetium-99m pertechnetate solutions |
US4093697A (en) * | 1976-03-16 | 1978-06-06 | Gesellschaft Fur Kernforschung M.B.H. | Process for recovering molybdenum-99 from a matrix containing neutron irradiated fissionable materials and fission products |
US4199551A (en) * | 1978-01-13 | 1980-04-22 | Amax Inc. | Recovery of molybdenum and uranium from activated charcoal containing molybdenum and residual uranium |
US4935373A (en) * | 1979-06-28 | 1990-06-19 | Radiometer A/S | Reference liquid |
US4701308A (en) * | 1984-12-28 | 1987-10-20 | Commissariat A L'energie Atomique | Process for the recovery of molybdenum-99 from an irradiated uranium alloy target |
AU582659B2 (en) * | 1985-06-13 | 1989-04-06 | Comurhex Societe Pour La Conversion De L'uranium En Metal Et Hexafluorure | Process for separation by precipitation of the molybdenum contained in sulphuric or nitric solutions of uranium |
US4981658A (en) * | 1986-05-15 | 1991-01-01 | Kernforschungezentrum Karlsruhe Gmbh | Process for the fine purification of fissionable molybdenum |
US4839133A (en) * | 1987-10-26 | 1989-06-13 | The United States Of America As Represented By The Department Of Energy | Target and method for the production of fission product molybdenum-99 |
US5802439A (en) * | 1997-02-19 | 1998-09-01 | Lockheed Martin Idaho Technologies Company | Method for the production of 99m Tc compositions from 99 Mo-containing materials |
US5802438A (en) * | 1997-02-19 | 1998-09-01 | Lockheed Martin Idaho Technologies Company | Method for generating a crystalline 99 MoO3 product and the isolation 99m Tc compositions therefrom |
US20020080907A1 (en) * | 2000-09-28 | 2002-06-27 | Carlo Rubbia | Method and device for heating gas from a thin layer of nuclear fuel, and space engine using such method |
US6876714B2 (en) * | 2000-09-28 | 2005-04-05 | Carlo Rubbia | Device for heating gas from a thin layer of nuclear fuel, and space engine incorporating such device |
US8666015B2 (en) | 2001-05-08 | 2014-03-04 | The Curators Of The University Of Missouri | Method and apparatus for generating thermal neutrons using an electron accelerator |
US8126104B2 (en) * | 2004-08-02 | 2012-02-28 | Battelle Memorial Institute | Medical radioisotopes and methods for producing the same |
US20090060812A1 (en) * | 2004-08-02 | 2009-03-05 | Schenter Robert E | Medical radioisotopes and methods for producing the same |
US8497683B2 (en) * | 2006-10-03 | 2013-07-30 | Invensys Systems, Inc. | Spectroscopic sample analyzer and sample handling system |
US20100066374A1 (en) * | 2006-10-03 | 2010-03-18 | Trygstad W Marcus | Sample analyzer and sampling system |
EP2250649A2 (en) * | 2008-02-05 | 2010-11-17 | The Curators Of The University Of Missouri | Radioisotope production and treatment of solution of target material |
AU2009212487B2 (en) * | 2008-02-05 | 2014-03-27 | The Curators Of The University Of Missouri | Radioisotope production and treatment of solution of target material |
US20090196390A1 (en) * | 2008-02-05 | 2009-08-06 | The Curators Of The University Of Missouri | Radioisotope production and treatment of solution of target material |
US8644442B2 (en) | 2008-02-05 | 2014-02-04 | The Curators Of The University Of Missouri | Radioisotope production and treatment of solution of target material |
KR101353730B1 (en) * | 2008-02-05 | 2014-01-20 | 더 큐레이터스 오브 더 유니버시티 오브 미주리 | Radioisotope production and treatment of solution of target material |
WO2009100063A2 (en) | 2008-02-05 | 2009-08-13 | The Curators Of The University Of Missouri | Radioisotope production and treatment of solution of target material |
EP2250649A4 (en) * | 2008-02-05 | 2011-05-18 | Univ Missouri | Radioisotope production and treatment of solution of target material |
US11830637B2 (en) * | 2008-05-02 | 2023-11-28 | Shine Technologies, Llc | Device and method for producing medical isotopes |
US20100169134A1 (en) * | 2008-12-31 | 2010-07-01 | Microsoft Corporation | Fostering enterprise relationships |
US9691511B1 (en) * | 2009-11-09 | 2017-06-27 | Sandia Corporation | Target-fueled nuclear reactor for medical isotope production |
US10978214B2 (en) | 2010-01-28 | 2021-04-13 | SHINE Medical Technologies, LLC | Segmented reaction chamber for radioisotope production |
US11894157B2 (en) | 2010-01-28 | 2024-02-06 | Shine Technologies, Llc | Segmented reaction chamber for radioisotope production |
US8449850B2 (en) | 2010-02-19 | 2013-05-28 | Babcock & Wilcox Technical Services Group, Inc. | Method and apparatus for the extraction and processing of molybdenum-99 |
RU2548033C2 (en) * | 2010-02-19 | 2015-04-10 | БЭБКОК ЭНД ВИЛКОКС Текникал Сервисез Груп, Инк. | Method and apparatus for extracting and processing molybdenum-99 |
WO2011103334A1 (en) * | 2010-02-19 | 2011-08-25 | Babcock & Wilcox | Method and apparatus for the extraction and processing of molybdenum-99 |
US20110206579A1 (en) * | 2010-02-19 | 2011-08-25 | Glenn Daniel E | Method and apparatus for the extraction and processing of molybdenum-99 |
US20110250107A1 (en) * | 2010-04-07 | 2011-10-13 | Jennifer Varnedoe | Column geometry to maximize elution efficiencies for molybdenum-99 |
US9240253B2 (en) * | 2010-04-07 | 2016-01-19 | Ge-Hitachi Nuclear Energy Americas Llc | Column geometry to maximize elution efficiencies for molybdenum-99 |
EP2398023A1 (en) | 2010-06-21 | 2011-12-21 | The European Union, represented by the European Commission | Production of molybdenum-99 |
EP2993669A1 (en) * | 2010-08-04 | 2016-03-09 | Mallinckrodt LLC | Purification apparatus for mo-99 |
US10767243B2 (en) | 2010-08-04 | 2020-09-08 | Curium Us Llc | Purification process |
WO2012018752A1 (en) * | 2010-08-04 | 2012-02-09 | Mallinckrodt Llc | Purification process |
US9856543B2 (en) | 2010-08-04 | 2018-01-02 | Mallinckrodt Nuclear Medicine Llc | Purification process |
DE102011002265B4 (en) * | 2011-04-26 | 2012-12-06 | Technische Universität München | Process for the preparation of starting material for a technetium generator |
DE102011002265A1 (en) * | 2011-04-26 | 2012-10-31 | Technische Universität München | Process for the preparation of starting material for a technetium generator |
WO2012146586A1 (en) * | 2011-04-26 | 2012-11-01 | Technische Universität München | Method for producing starting material for a technetium generator |
US10734126B2 (en) * | 2011-04-28 | 2020-08-04 | SHINE Medical Technologies, LLC | Methods of separating medical isotopes from uranium solutions |
US20140140462A1 (en) * | 2011-07-13 | 2014-05-22 | Luis A.M.M. Barbosa | Process |
US20130136221A1 (en) * | 2011-11-14 | 2013-05-30 | Japan Atomic Energy Agency | Method of producing radioactive molybdenum |
US11361873B2 (en) | 2012-04-05 | 2022-06-14 | Shine Technologies, Llc | Aqueous assembly and control method |
US9330800B2 (en) * | 2012-12-03 | 2016-05-03 | Wisconsin Alumni Research Foundation | Dry phase reactor for generating medical isotopes |
US20140153684A1 (en) * | 2012-12-03 | 2014-06-05 | Wisconsin Alumni Research Foundation | Dry Phase Reactor for Generating Medical Isotopes |
US9997267B2 (en) | 2013-02-13 | 2018-06-12 | Battelle Memorial Institute | Nuclear reactor target assemblies, nuclear reactor configurations, and methods for producing isotopes, modifying materials within target material, and/or characterizing material within a target material |
WO2014137439A2 (en) | 2013-02-13 | 2014-09-12 | Battelle Memorial Institute | Nuclear reactor target assemblies, nuclear reactor configurations, and methods for producing isotopes, modifying materials within target material, and/or characterizing meaterial within a target material |
US9842664B2 (en) | 2013-09-26 | 2017-12-12 | Los Alamos National Security, Llc | Recovering and recycling uranium used for production of molybdenum-99 |
US9793023B2 (en) | 2013-09-26 | 2017-10-17 | Los Alamos National Security, Llc | Recovery of uranium from an irradiated solid target after removal of molybdenum-99 produced from the irradiated target |
CN109285616A (en) * | 2018-11-16 | 2019-01-29 | 中国原子能科学研究院 | From235It is extracted in U fission product99The device of Mo and utilization device extraction99The method of Mo |
WO2021211870A3 (en) * | 2020-04-16 | 2021-11-18 | Uchicago Argonne, Llc | Technetium-99m generator for enriched molybdenum |
WO2022005882A3 (en) * | 2020-06-30 | 2022-04-07 | Uchicago Argonne, Llc | System and method for producing molybdenum 99 |
WO2022079600A1 (en) | 2020-10-14 | 2022-04-21 | Narodowe Centrum Badan Jadrowych | A method of fabricating a uranium target for producing molybdenum, a process of producing molybdenum, and a uranium target for producing molybdenum |
EP3985686A1 (en) | 2020-10-14 | 2022-04-20 | Narodowe Centrum Badan Jadrowych | Method of preparation of the uranium target for the production of molybdenum, molybdenum production process and the uranium target for the production of molybdenum |
Also Published As
Publication number | Publication date |
---|---|
DE2231976B2 (en) | 1979-07-19 |
IL39793A (en) | 1976-01-30 |
NL172495B (en) | 1983-04-05 |
FR2157781A1 (en) | 1973-06-08 |
NL7209050A (en) | 1973-01-03 |
NL172495C (en) | 1983-09-01 |
IL39793A0 (en) | 1972-09-28 |
FR2157781B1 (en) | 1976-10-29 |
DE2231976C3 (en) | 1980-03-27 |
GB1389905A (en) | 1975-04-09 |
BE785637A (en) | 1972-12-29 |
DE2231976A1 (en) | 1973-01-11 |
JPS517800B1 (en) | 1976-03-11 |
CA969373A (en) | 1975-06-17 |
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Legal Events
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AS | Assignment |
Owner name: CINTICHEM, INC., LONG MEADOW ROAD, P.O. BOX 204, T Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNION CARBIDE CORPORATION, A CORP. OF NY;REEL/FRAME:003951/0224 Effective date: 19810428 Owner name: CINTICHEM, INC., A CORP. OF DE, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNION CARBIDE CORPORATION, A CORP. OF NY;REEL/FRAME:003951/0224 Effective date: 19810428 Owner name: CINTICHEM, INC., NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNION CARBIDE CORPORATION, A CORP. OF NY;REEL/FRAME:003951/0224 Effective date: 19810428 |
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Owner name: UNITED STATES OF AMERICA, THE, AS REPRESENTATIVE B Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CINTICHEM, INC.;REEL/FRAME:005939/0818 Effective date: 19911127 |