|
| US4679800 | 15. Okt. 1984 | 14. Juli 1987 | Hydril Company | Hawser chain seal assembly |
| US4817724 | 19. Aug. 1988 | 4. Apr. 1989 | Vetco Gray Inc. | Diverter system test tool and method |
| US5247974 | 21. Jan. 1992 | 28. Sept. 1993 | Thetford Corporation | Pneumatic sealing device for waste disposal systems |
| US6286603 | 3. Febr. 2000 | 11. Sept. 2001 | Solinst Canada Limited | Packing system and method for boreholes |
| US6601852 | 17. Nov. 2000 | 5. Aug. 2003 | Hilti Aktiengesellschaft | Method and apparatus for sealing a space |
