Columbian Carbon Co
ColumbianActive Patents
0
Total Holdings
14
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3406426A | Apparatus for forming aggregates of powdered materials | Expired / Lapsed | 1966-10-25 | 1968-10-22 | 0 | Details |
| US3345356A | Process for preparing aromatic azo compounds | Expired / Lapsed | 1963-11-29 | 1967-10-03 | 2 | Details |
| US2903589A | Method for preparing an electron microscope specimen | Expired / Lapsed | 1955-06-09 | 1959-09-08 | 0 | Details |
| US2861294A | Apparatus for treating carbon black | Expired / Lapsed | 1957-12-16 | 1958-11-25 | 0 | Details |
| US2659662A | Process for producing carbon black | Expired / Lapsed | 1950-11-14 | 1953-11-17 | 2 | Details |
| US2659663A | Process for producing carbon black | Expired / Lapsed | 1950-11-14 | 1953-11-17 | 0 | Details |
| US2550802A | Carbon black | Expired / Lapsed | 1947-10-15 | 1951-05-01 | 2 | Details |
| US2524433A | Magnetic recording | Expired / Lapsed | 1947-12-11 | 1950-10-03 | 2 | Details |
| US2518211A | Carbon black | Expired / Lapsed | 1946-01-28 | 1950-08-08 | 2 | Details |
| US2499438A | Manufacture of carbon black | Expired / Lapsed | 1944-09-12 | 1950-03-07 | 2 | Details |
| US2482853A | Microtome with rotating cutter and specimen feed mechanism … | Expired / Lapsed | 1946-02-07 | 1949-09-27 | 0 | Details |
| US2440424A | Manufacture of carbon black | Expired / Lapsed | 1944-05-04 | 1948-04-27 | 0 | Details |
| US2393106A | Furnace | Expired / Lapsed | 1942-12-08 | 1946-01-15 | 0 | Details |
| US2139585A | Manufacture of carbon black | Expired / Lapsed | 1935-04-18 | 1938-12-06 | 0 | Details |