|
| US4208285 | 20 Oct 1978 | 17 Jun 1980 | Dresser Industries, Inc. | Drill cuttings disposal system with good environmental and ecological properties |
| US5156686 | 30 Nov 1990 | 20 Oct 1992 | Union Oil Company of California | Separation of oils from solids |
| US5213625 | 25 Jun 1992 | 25 May 1993 | Union Oil Company of California | Separation of oils from solids |
| US5215596 | 25 Jun 1992 | 1 Jun 1993 | Union Oil Company of California | Separation of oils from solids |
| US5234577 | 25 Jun 1992 | 10 Aug 1993 | Union Oil Company of California | Separation of oils from solids |
| US5316029 | 7 May 1992 | 31 May 1994 | Separation Oil Services, Inc. | Oil separator |
| US5422019 | 23 Feb 1994 | 6 Jun 1995 | | Method for removing contaminants from industrial cleaning systems |
| US5637152 | 29 Mar 1995 | 10 Jun 1997 | Separation Oil Services, Inc. | Soil washing apparatus and method |
