Bell and Howell Co
Bell and HActive Patents
0
Total Holdings
63
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 |
| US4200224A | Method and system for isolating faults in a microprocessor … | Expired / Lapsed | 1978-08-21 | 1980-04-29 | 19 | Details |
| US4179709A | Video information bandwidth compression | Expired / Lapsed | 1978-01-10 | 1979-12-18 | 148 | Details |
| US4157533A | Independent channel automatic gain control for self-scannin… | Expired / Lapsed | 1977-11-25 | 1979-06-05 | 14 | Details |
| US4093376A | Automatic exposure control | Expired / Lapsed | 1976-06-01 | 1978-06-06 | 15 | Details |
| US4086000A | Viewfinder optics with zero power doublet | Expired / Lapsed | 1976-08-23 | 1978-04-25 | 12 | Details |
| US4066349A | Information retrieval system having ramp motor control | Expired / Lapsed | 1976-10-01 | 1978-01-03 | 12 | Details |
| US4034973A | Automated in-line mailing system | Expired / Lapsed | 1975-12-19 | 1977-07-12 | 25 | Details |
| US3956701A | Personal paging receiver with swivel clip and distributed a… | Expired / Lapsed | 1974-09-18 | 1976-05-11 | 22 | Details |
| US3902800A | Copying system, method and components | Expired / Lapsed | 1974-01-30 | 1975-09-02 | 10 | Details |
| US3836249A | Optical imaging system of short focal lens | Expired / Lapsed | 1972-09-13 | 1974-09-17 | 12 | Details |
| US3760164A | Magnetically striped cards for use in a speed machine | Expired / Lapsed | 1972-11-10 | 1973-09-18 | 6 | Details |
| US3723666A | Method for distinguishing pauses in recorded features durin… | Expired / Lapsed | 1971-03-23 | 1973-03-27 | 15 | Details |
| US3722892A | Tape recorder with cassette changer | Expired / Lapsed | 1970-06-29 | 1973-03-27 | 19 | Details |
| US3717459A | Method of imaging involving pre-heating using interdigitate… | Expired / Lapsed | 1970-04-17 | 1973-02-20 | 12 | Details |
| US3717460A | A method of imaging using interdigitated electrodes, a phot… | Expired / Lapsed | 1970-04-17 | 1973-02-20 | 17 | Details |
| US3715161A | Lens focusing mechanism with manual control | Expired / Lapsed | 1971-05-28 | 1973-02-06 | 0 | Details |
| US3617846A | Dc motor projector drive system | Expired / Lapsed | 1969-12-30 | 1971-11-02 | 5 | Details |
| US3617761A | Radiation sensitive remote control system | Expired / Lapsed | 1969-12-15 | 1971-11-02 | 22 | Details |
| US3603597A | Tape recorder | Expired / Lapsed | 1969-04-25 | 1971-09-07 | 51 | 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 |
| US3517993A | Development apparatus for continuous rotary electrostatogra… | Expired / Lapsed | 1965-10-23 | 1970-06-30 | 2 | Details |
| US3472066A | Engine testing apparatus | Expired / Lapsed | 1968-01-19 | 1969-10-14 | 0 | Details |
| US3450468A | Projection system for projecting constant size images from … | Expired / Lapsed | 1966-06-16 | 1969-06-17 | 0 | Details |
| US3399307A | Motion sensing exposure system for optical instruments | Expired / Lapsed | 1965-05-20 | 1968-08-27 | 2 | Details |
| US3397303A | Conveying belt with integral electric heater and sheet memb… | Expired / Lapsed | 1965-10-23 | 1968-08-13 | 0 | Details |
| US3373265A | Information storage and retrieval process and coded record … | Expired / Lapsed | 1962-12-12 | 1968-03-12 | 1 | Details |
| US3357779A | Motion picture camera | Expired / Lapsed | 1964-07-06 | 1967-12-12 | 2 | Details |
| US3354774A | Data abstract recording machines | Expired / Lapsed | 1964-06-01 | 1967-11-28 | 2 | Details |
| US3176575A | Low reflectance optical member coatings with barrier layer | Expired / Lapsed | 1960-12-19 | 1965-04-06 | 1 | Details |
| US3065578A | Signal pattern controlled machines | Expired / Lapsed | 1960-08-08 | 1962-11-27 | 0 | 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 |
| US2678357A | Magnetic sound and combined optical and magnetic sound tran… | Expired / Lapsed | 1951-03-27 | 1954-05-11 | 0 | Details |
| US2584695A | Electrostatic reproduction process and apparatus | Expired / Lapsed | 1947-08-14 | 1952-02-05 | 0 | Details |
| US2511517A | Method of producing optical glass of varied refractive index | Expired / Lapsed | 1947-01-31 | 1950-06-13 | 2 | Details |
| US2424339A | Picture projecting apparatus and projection system therefor | Expired / Lapsed | 1944-05-01 | 1947-07-22 | 0 | Details |
| US2420503A | Optical reticle | Expired / Lapsed | 1944-08-31 | 1947-05-13 | 0 | Details |
| US2393832A | Optical reticle | Expired / Lapsed | 1944-08-30 | 1946-01-29 | 0 | Details |
| US2375706A | Slide projector apparatus | Expired / Lapsed | 1942-06-17 | 1945-05-08 | 0 | Details |
| US2362676A | Centrifugally controlled governor device | Expired / Lapsed | 1943-06-29 | 1944-11-14 | 0 | Details |
| US2307297A | Photographic dissolve device | Expired / Lapsed | 1940-09-03 | 1943-01-05 | 0 | Details |
| US2302134A | Adjustable mechanism | Expired / Lapsed | 1940-09-03 | 1942-11-17 | 0 | Details |
| US2293576A | Photographic exposure meter | Expired / Lapsed | 1941-04-29 | 1942-08-18 | 0 | Details |
| US2269794A | Ventilated lamp house | Expired / Lapsed | 1939-07-17 | 1942-01-13 | 0 | Details |
| US2229861A | Electrical circuit device | Expired / Lapsed | 1938-10-28 | 1941-01-28 | 0 | Details |
| US2028608A | Motion picture camera and the like | Expired / Lapsed | 1931-01-12 | 1936-01-21 | 0 | Details |
| US1954392A | Sound reproducing apparatus | Expired / Lapsed | 1931-05-08 | 1934-04-10 | 0 | Details |
| US1947669A | Lens of variable equivalent focal length | Expired / Lapsed | 1931-09-28 | 1934-02-20 | 0 | Details |
| US1919554A | Tripod head or the like | Expired / Lapsed | 1929-12-23 | 1933-07-25 | 0 | Details |
| US1882014A | Perforated strip sprocket feed mechanism | Expired / Lapsed | 1930-07-08 | 1932-10-11 | 0 | Details |
| US1863891A | Photographic camera support | Expired / Lapsed | 1930-11-13 | 1932-06-21 | 0 | Details |
| US1826115A | Humidor | Expired / Lapsed | 1929-08-12 | 1931-10-06 | 0 | Details |
| US1767849A | Plural-lens-adjusting means | Expired / Lapsed | 1928-11-10 | 1930-06-24 | 0 | Details |
| US1767846A | Intermittent-feed mechanism | Expired / Lapsed | 1925-11-21 | 1930-06-24 | 0 | Details |
| US1723701A | Optical device | Expired / Lapsed | 1927-04-30 | 1929-08-06 | 0 | Details |
| US1056794A | Photographic-printing apparatus. | Expired / Lapsed | 1909-03-06 | 1913-03-25 | 0 | Details |