|
| US4188174 | 2. Sept. 1977 | 12. Febr. 1980 | California Institute of Technology | Wear resistant valve |
| US4372338 | 22. Juli 1980 | 8. Febr. 1983 | Dresser Industries, Inc. | High pressure valve assembly |
| US4552334 | 30. Apr. 1984 | 12. Nov. 1985 | Kawasaki Steel Corporation Denka Consultant & Engineering Company Limited | Flow change-over valve for the blowing of fluids into molten metal vessel |
| US4767028 | 15. Jan. 1988 | 30. Aug. 1988 | Phillips Petroleum Company | Rotary valve |
| US4773565 | 5. Apr. 1985 | 27. Sept. 1988 | Phillips Petroleum Company | Rotary valve |
| US4773626 | 2. Dez. 1983 | 27. Sept. 1988 | Phillips Petroleum Company | Rotary valve |
| US4898327 | 22. Aug. 1988 | 6. Febr. 1990 | Sealed Air Corporation | Injection system for foamable compositions |