Blackhawk Manufacturing Co
BlackhawkActive Patents
0
Total Holdings
10
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2914369A | Fluid seal | Expired / Lapsed | 1958-03-18 | 1959-11-24 | 0 | Details |
| US2814540A | Piston packing | Expired / Lapsed | 1956-07-16 | 1957-11-26 | 0 | Details |
| US2286880A | Hydraulic control system | Expired / Lapsed | 1940-07-05 | 1942-06-16 | 0 | Details |
| US2231680A | Hydraulic ram construction | Expired / Lapsed | 1937-05-10 | 1941-02-11 | 0 | Details |
| US2218318A | Detachable conduit coupling | Expired / Lapsed | 1939-05-01 | 1940-10-15 | 0 | Details |
| US2188957A | Packing | Expired / Lapsed | 1936-03-11 | 1940-02-06 | 0 | Details |
| US2138194A | Hydraulic pump | Expired / Lapsed | 1936-03-11 | 1938-11-29 | 0 | Details |
| US2100564A | Method of producing a pulling stress and hydraulic pulling … | Expired / Lapsed | 1935-03-16 | 1937-11-30 | 0 | Details |
| US1982008A | Coupling | Expired / Lapsed | 1934-02-23 | 1934-11-27 | 0 | Details |
| US1936640A | Reversible friction clutch | Expired / Lapsed | 1931-08-14 | 1933-11-28 | 0 | Details |