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 |
|---|---|---|---|---|---|---|
| US2918015A | Free piston pumping device for gas wells and oil wells | Expired / Lapsed | 1958-09-02 | 1959-12-22 | 0 | Details |
| US2699121A | Plunger lift | Expired / Lapsed | 1949-07-25 | 1955-01-11 | 0 | Details |
| US2661024A | Plunger construction | Expired / Lapsed | 1947-08-08 | 1953-12-01 | 0 | Details |
| US2642002A | Plunger lift device | Expired / Lapsed | 1949-03-28 | 1953-06-16 | 0 | Details |
| US2494128A | Method of increasing the axial tensile strength of threaded… | Expired / Lapsed | 1945-11-14 | 1950-01-10 | 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 |
| US2237715A | Rotary swivel | Expired / Lapsed | 1939-12-18 | 1941-04-08 | 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 |
| 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 |
| US1887865A | Casing head | Expired / Lapsed | 1931-04-22 | 1932-11-15 | 0 | Details |
| US1834190A | Packing head | Expired / Lapsed | 1931-03-14 | 1931-12-01 | 0 | Details |
| US1830440A | Swivel wash pipe construction | Expired / Lapsed | 1929-09-03 | 1931-11-03 | 0 | Details |
| US1811885A | Float plug and guide for well casings | Expired / Lapsed | 1928-04-23 | 1931-06-30 | 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 |