National Supply Co
National SActive Patents
0
Total Holdings
20
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2650796A | Drawworks feed control | Expired / Lapsed | 1948-02-09 | 1953-09-01 | 0 | Details |
| US2642002A | Plunger lift device | Expired / Lapsed | 1949-03-28 | 1953-06-16 | 0 | Details |
| US2304402A | Weight indicator | Expired / Lapsed | 1941-08-01 | 1942-12-08 | 0 | Details |
| US2263750A | Valve seat | Expired / Lapsed | 1940-06-19 | 1941-11-25 | 0 | Details |
| US2240795A | Drilling machine | Expired / Lapsed | 1938-01-21 | 1941-05-06 | 0 | Details |
| US2221189A | Rotary pump | Expired / Lapsed | 1938-01-03 | 1940-11-12 | 0 | Details |
| US2198836A | Surveying apparatus | Expired / Lapsed | 1937-11-06 | 1940-04-30 | 0 | Details |
| US2185822A | Rotary swivel | Expired / Lapsed | 1937-11-06 | 1940-01-02 | 0 | Details |
| US2177100A | Leak-resisting pipe thread | Expired / Lapsed | 1938-09-21 | 1939-10-24 | 0 | Details |
| US2111196A | Well casing joint | Expired / Lapsed | 1935-02-26 | 1938-03-15 | 0 | Details |
| US1925335A | Ball joint steel hose coupling | Expired / Lapsed | 1930-12-12 | 1933-09-05 | 0 | Details |
| US1925348A | Pumper | Expired / Lapsed | 1928-11-14 | 1933-09-05 | 0 | Details |
| US1909602A | Slip with removable liner | Expired / Lapsed | 1928-01-11 | 1933-05-16 | 0 | Details |
| US1887865A | Casing head | Expired / Lapsed | 1931-04-22 | 1932-11-15 | 0 | Details |
| US1863401A | Rotary drawworks | Expired / Lapsed | 1927-11-09 | 1932-06-14 | 0 | Details |
| US1811885A | Float plug and guide for well casings | Expired / Lapsed | 1928-04-23 | 1931-06-30 | 0 | Details |
| US1781091A | Pipe joint | Expired / Lapsed | 1924-07-19 | 1930-11-11 | 0 | Details |
| US1777680A | Gas-lift pump | Expired / Lapsed | 1927-05-27 | 1930-10-07 | 0 | Details |
| US1767538A | Back-pressure valve for drill pipes | Expired / Lapsed | 1928-06-11 | 1930-06-24 | 0 | Details |
| US1714740A | Slush-pump valve | Expired / Lapsed | 1927-04-18 | 1929-05-28 | 0 | Details |