Hydraulic Development Corp Inc
HydraulicActive Patents
0
Total Holdings
35
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2420155A | Control mechanism for hydraulic transmissions | Expired / Lapsed | 1941-05-31 | 1947-05-06 | 0 | Details |
| US2411971A | Extrusion machine | Expired / Lapsed | 1943-03-10 | 1946-12-03 | 0 | Details |
| US2406482A | Hydraulically controlled machine tool | Expired / Lapsed | 1942-04-27 | 1946-08-27 | 0 | Details |
| US2399404A | Precision pressure measuring press | Expired / Lapsed | 1943-07-05 | 1946-04-30 | 0 | Details |
| US2398318A | Method and apparatus for plastic injection | Expired / Lapsed | 1943-06-12 | 1946-04-09 | 0 | Details |
| US2398227A | Briquetting press | Expired / Lapsed | 1943-04-02 | 1946-04-09 | 0 | Details |
| US2392203A | Horizontal injection press | Expired / Lapsed | 1941-06-21 | 1946-01-01 | 0 | Details |
| US2390359A | Triple action automobile body press | Expired / Lapsed | 1940-06-24 | 1945-12-04 | 0 | Details |
| US2384218A | Hydraulic transmission | Expired / Lapsed | 1941-05-31 | 1945-09-04 | 0 | Details |
| US2382045A | Method of forging | Expired / Lapsed | 1942-06-19 | 1945-08-14 | 0 | Details |
| US2374630A | Twin-cylinder constant speed hydraulic system | Expired / Lapsed | 1943-01-23 | 1945-04-24 | 0 | Details |
| US2374593A | Solenoid operated valve | Expired / Lapsed | 1942-04-01 | 1945-04-24 | 0 | Details |
| US2366388A | Multiple stage pumping system | Expired / Lapsed | 1942-04-29 | 1945-01-02 | 0 | Details |
| US2366417A | Continuous extrusion molding of plastics | Expired / Lapsed | 1942-03-30 | 1945-01-02 | 0 | Details |
| US2363760A | Control system | Expired / Lapsed | 1942-11-12 | 1944-11-28 | 0 | Details |
| US2360023A | Control of weld lines | Expired / Lapsed | 1942-04-28 | 1944-10-10 | 0 | Details |
| US2359013A | Method of injection molding granular materials | Expired / Lapsed | 1941-04-14 | 1944-09-26 | 0 | Details |
| US2349082A | Press frame construction | Expired / Lapsed | 1942-12-11 | 1944-05-16 | 0 | Details |
| US2348197A | Briquetting press molding process | Expired / Lapsed | 1940-09-16 | 1944-05-09 | 0 | Details |
| US2343139A | High speed forging press | Expired / Lapsed | 1941-07-17 | 1944-02-29 | 0 | Details |
| US2343177A | Hydraulic press | Expired / Lapsed | 1941-06-25 | 1944-02-29 | 0 | Details |
| US2343167A | Press leveling means | Expired / Lapsed | 1941-06-21 | 1944-02-29 | 0 | Details |
| US2333056A | Turret type injection press | Expired / Lapsed | 1940-12-16 | 1943-10-26 | 0 | Details |
| US2322200A | Injection unit | Expired / Lapsed | 1940-10-24 | 1943-06-15 | 0 | Details |
| US2318203A | Plastic injection machine | Expired / Lapsed | 1939-07-19 | 1943-05-04 | 0 | Details |
| US2317549A | Electrically controlled reciprocating fluid motor | Expired / Lapsed | 1940-07-06 | 1943-04-27 | 0 | Details |
| US2316944A | Valve | Expired / Lapsed | 1941-12-22 | 1943-04-20 | 0 | Details |
| US2302922A | Variable delivery pilot pump control system | Expired / Lapsed | 1940-01-04 | 1942-11-24 | 0 | Details |
| US2293334A | Check and unloading valve structure | Expired / Lapsed | 1939-09-28 | 1942-08-18 | 0 | Details |
| US2292827A | Press with plate type frame | Expired / Lapsed | 1939-01-05 | 1942-08-11 | 0 | Details |
| US2283397A | Valve | Expired / Lapsed | 1938-08-22 | 1942-05-19 | 0 | Details |
| US2269332A | Synchronizing airplane engines | Expired / Lapsed | 1939-02-23 | 1942-01-06 | 0 | Details |
| US2258886A | Mechanism for varying the speed of hydraulic press rams | Expired / Lapsed | 1938-07-21 | 1941-10-14 | 0 | Details |
| US2230055A | Self-centering pump control mechanism | Expired / Lapsed | 1939-10-23 | 1941-01-28 | 0 | Details |
| US2229965A | Hydraulic press circuit | Expired / Lapsed | 1938-08-16 | 1941-01-28 | 0 | Details |