JOHN M HOPWOOD
JOHN M HOPActive Patents
0
Total Holdings
6
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2357318A | Pressure-actuated valve and vibration damping means therefor | Expired / Lapsed | 1940-06-10 | 1944-09-05 | 0 | Details |
| US2349329A | Control system | Expired / Lapsed | 1942-06-22 | 1944-05-23 | 0 | Details |
| US2304783A | Pressure responsive ratio relay | Expired / Lapsed | 1940-06-10 | 1942-12-15 | 0 | Details |
| US2304782A | Pressure-responsive device | Expired / Lapsed | 1940-06-10 | 1942-12-15 | 0 | Details |
| US2016824A | Control system and relay device therefor | Expired / Lapsed | 1933-03-28 | 1935-10-08 | 0 | Details |
| US1958644A | Method of and apparatus for reducing fluid pressures | Expired / Lapsed | 1930-12-11 | 1934-05-15 | 0 | Details |