|
| US4351478 | 18 Ago 1980 | 28 Sep 1982 | | Apparatus for cleaning tanks or vessels |
| US4407678 | 11 Sep 1981 | 4 Oct 1983 | Butterworth Systems Inc. | Sludge removal machine |
| US4685974 | 20 Jun 1983 | 11 Ago 1987 | Butterworth Systems, Inc. | Method for clearing settled sludge |
| US4700728 | 3 Sep 1985 | 20 Oct 1987 | | Device for cleaning paint rollers |
| US4941493 | 15 Ago 1988 | 17 Jul 1990 | Carry Companies of Illinois | Device for washing and drying the inside tank of a tanker truck |
| US4945933 | 11 Abr 1988 | 7 Ago 1990 | Serv-Tech, Inc. | Liquid circulator useful for dispersing sediment contained in a storage tank |
| US5058612 | 16 Abr 1990 | 22 Oct 1991 | | Portable spray cleaning apparatus |
| US5445173 | 18 Jul 1994 | 29 Ago 1995 | Matrix Service, Inc. | System for stirring and thereby reducing build up of bottom sediments in a storage tank |
| US5460331 | 17 Jun 1994 | 24 Oct 1995 | Serv-Tech, Inc. | Apparatus for dispersion of sludge in a crude oil storage tank |
| US5542984 | 10 May 1995 | 6 Ago 1996 | Serv-Tech, Inc. | Method for dispersion of sludge and for preparing a circulator for dispersing sludge |
| US6213134 | 26 Feb 1999 | 10 Abr 2001 | Econo Clean, Incorporated | Interior tank car cleaning apparatus |
| US6321754 | 13 Ene 1999 | 27 Nov 2001 | Taiho Industries Co., Ltd. | Tank washing apparatus and method |
| US8096177 | 19 Nov 2008 | 17 Ene 2012 | Petroleum Recovery Services LLC | Fuel inventory monitoring system |
| US8171786 | 15 May 2009 | 8 May 2012 | Petroleum Recovery Services, LLC | Fuel inventory monitoring system |
