National Tube Co
National TActive Patents
0
Total Holdings
8
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2508914A | Pipe coupling | Expired / Lapsed | 1947-03-05 | 1950-05-23 | 0 | Details |
| US2408325A | Working tubular articles | Expired / Lapsed | 1944-10-21 | 1946-09-24 | 0 | Details |
| US2336526A | Means for controlling the operation of pumps and the like | Expired / Lapsed | 1941-07-02 | 1943-12-14 | 0 | Details |
| US2233734A | Pipe joint | Expired / Lapsed | 1939-06-01 | 1941-03-04 | 0 | Details |
| US2139067A | Continuous heating furnace | Expired / Lapsed | 1937-02-11 | 1938-12-06 | 0 | Details |
| US2132574A | Pipe joint | Expired / Lapsed | 1936-10-22 | 1938-10-11 | 0 | Details |
| US1994683A | Apparatus for casting ingots | Expired / Lapsed | 1933-12-30 | 1935-03-19 | 0 | Details |
| US1782316A | Method of welding | Expired / Lapsed | 1929-05-10 | 1930-11-18 | 0 | Details |