National Tube Co
National TActive Patents
0
Total Holdings
31
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2551484A | Metal cask or tank with belt weld | Expired / Lapsed | 1948-03-24 | 1951-05-01 | 0 | Details |
| US2508914A | Pipe coupling | Expired / Lapsed | 1947-03-05 | 1950-05-23 | 0 | Details |
| US2480230A | Gas igniter for blast furnace bleeder stacks and the like | Expired / Lapsed | 1944-10-06 | 1949-08-30 | 0 | Details |
| US2415746A | Metal severing apparatus | Expired / Lapsed | 1945-01-24 | 1947-02-11 | 0 | Details |
| US2408325A | Working tubular articles | Expired / Lapsed | 1944-10-21 | 1946-09-24 | 0 | Details |
| US2371348A | Method of making composite tubes | Expired / Lapsed | 1942-12-18 | 1945-03-13 | 0 | Details |
| US2336526A | Means for controlling the operation of pumps and the like | Expired / Lapsed | 1941-07-02 | 1943-12-14 | 0 | Details |
| US2336538A | Burner control for reversing furnaces | Expired / Lapsed | 1940-09-03 | 1943-12-14 | 0 | Details |
| US2250349A | Lubricating device | Expired / Lapsed | 1939-09-12 | 1941-07-22 | 0 | Details |
| US2249395A | Oil valve for cutting machines | Expired / Lapsed | 1939-06-10 | 1941-07-15 | 0 | Details |
| US2233734A | Pipe joint | Expired / Lapsed | 1939-06-01 | 1941-03-04 | 0 | Details |
| US2224145A | Method of making pipe connections | Expired / Lapsed | 1938-03-26 | 1940-12-10 | 0 | Details |
| US2215930A | Pipe or tube | Expired / Lapsed | 1939-05-17 | 1940-09-24 | 0 | Details |
| US2209968A | Manufacture of bessemer steel seamless tubes | Expired / Lapsed | 1938-05-02 | 1940-08-06 | 0 | Details |
| US2196922A | Optical inspection apparatus | Expired / Lapsed | 1936-09-24 | 1940-04-09 | 0 | Details |
| US2181784A | Scaffold | Expired / Lapsed | 1938-02-04 | 1939-11-28 | 0 | Details |
| US2179176A | Apparatus for welding pipes and tubes | Expired / Lapsed | 1937-03-01 | 1939-11-07 | 0 | Details |
| US2139067A | Continuous heating furnace | Expired / Lapsed | 1937-02-11 | 1938-12-06 | 0 | Details |
| US2132565A | Method of making a tubular article | Expired / Lapsed | 1937-05-13 | 1938-10-11 | 0 | Details |
| US2132574A | Pipe joint | Expired / Lapsed | 1936-10-22 | 1938-10-11 | 0 | Details |
| US2099462A | Apparatus for drying pipe coatings | Expired / Lapsed | 1936-08-26 | 1937-11-16 | 0 | Details |
| US2056918A | Measuring device | Expired / Lapsed | 1935-09-23 | 1936-10-06 | 0 | Details |
| US1994683A | Apparatus for casting ingots | Expired / Lapsed | 1933-12-30 | 1935-03-19 | 0 | Details |
| US1994725A | Apparatus for reducing the diameter of the ends of pipes an… | Expired / Lapsed | 1933-04-28 | 1935-03-19 | 0 | Details |
| US1895726A | Heating furnace | Expired / Lapsed | 1931-08-12 | 1933-01-31 | 0 | Details |
| US1782316A | Method of welding | Expired / Lapsed | 1929-05-10 | 1930-11-18 | 0 | Details |
| US1460769A | Pipe | Expired / Lapsed | 1921-07-07 | 1923-07-03 | 0 | Details |
| US1407439A | Pipe-sawing apparatus | Expired / Lapsed | 1921-01-15 | 1922-02-21 | 0 | Details |
| US853900A | Pipe-joint. | Expired / Lapsed | 1906-07-26 | 1907-05-14 | 0 | Details |
| US771611A | Swaging-mill. | Expired / Lapsed | 1901-12-12 | 1904-10-04 | 0 | Details |
| US745759A | Resisting device. | Expired / Lapsed | 1902-08-06 | 1903-12-01 | 0 | Details |