Bell and Howell Co
Bell and HActive Patents
0
Total Holdings
20
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| GB1313226A | Information replay methods and apparatus | Expired / Lapsed | 1970-11-02 | — | 0 | Details |
| US4210785A | Tape replay system | Expired / Lapsed | 1978-09-28 | 1980-07-01 | 20 | Details |
| US3723666A | Method for distinguishing pauses in recorded features durin… | Expired / Lapsed | 1971-03-23 | 1973-03-27 | 15 | Details |
| US3617761A | Radiation sensitive remote control system | Expired / Lapsed | 1969-12-15 | 1971-11-02 | 22 | Details |
| US3601553A | Information replay apparatus | Expired / Lapsed | 1970-07-21 | 1971-08-24 | 5 | Details |
| US3590771A | Scene finder for projector cartridge | Expired / Lapsed | 1970-06-26 | 1971-07-06 | 6 | Details |
| US3583786A | Optical waveguide formed of cylinders with optically smooth… | Expired / Lapsed | 1969-09-23 | 1971-06-08 | 8 | Details |
| US3557305A | Dc restoration and white clipping circuit for video recorder | Expired / Lapsed | 1968-03-06 | 1971-01-19 | 11 | Details |
| US3542947A | Video display of line sequential color signal | Expired / Lapsed | 1968-01-19 | 1970-11-24 | 0 | Details |
| US3399307A | Motion sensing exposure system for optical instruments | Expired / Lapsed | 1965-05-20 | 1968-08-27 | 2 | Details |
| US2956748A | Digital subtractor | Expired / Lapsed | 1956-08-08 | 1960-10-18 | 0 | Details |
| US2945212A | Apparatus for reproducing intelligence by compound modulati… | Expired / Lapsed | 1954-08-02 | 1960-07-12 | 0 | Details |
| US2931963A | Linear induction motor servosystem for recording oscillogra… | Expired / Lapsed | 1957-02-04 | 1960-04-05 | 0 | Details |
| US2511517A | Method of producing optical glass of varied refractive index | Expired / Lapsed | 1947-01-31 | 1950-06-13 | 2 | Details |
| US2420503A | Optical reticle | Expired / Lapsed | 1944-08-31 | 1947-05-13 | 0 | Details |
| US2362676A | Centrifugally controlled governor device | Expired / Lapsed | 1943-06-29 | 1944-11-14 | 0 | Details |
| US2269794A | Ventilated lamp house | Expired / Lapsed | 1939-07-17 | 1942-01-13 | 0 | Details |
| US2028608A | Motion picture camera and the like | Expired / Lapsed | 1931-01-12 | 1936-01-21 | 0 | Details |
| US1882014A | Perforated strip sprocket feed mechanism | Expired / Lapsed | 1930-07-08 | 1932-10-11 | 0 | Details |
| US1723701A | Optical device | Expired / Lapsed | 1927-04-30 | 1929-08-06 | 0 | Details |