Simmon Brothers Inc
Simmon BroActive Patents
0
Total Holdings
14
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3086709A | Density control for photographic enlargers | Expired / Lapsed | 1960-02-17 | 1963-04-23 | 2 | Details |
| US2679784A | Lantern slide projector having lenses of different focus | Expired / Lapsed | 1951-05-16 | 1954-06-01 | 0 | Details |
| US2573113A | Computing device for photographic color printing processes … | Expired / Lapsed | 1949-08-17 | 1951-10-30 | 0 | Details |
| US2565399A | Machine for making photographic color prints | Expired / Lapsed | 1949-09-30 | 1951-08-21 | 0 | Details |
| US2474380A | Device for modifying electrical signals | Expired / Lapsed | 1947-12-12 | 1949-06-28 | 0 | Details |
| US2470584A | Illuminating system and control device for photographic enl… | Expired / Lapsed | 1947-06-20 | 1949-05-17 | 0 | Details |
| US2467057A | Cathode-ray tube device to measure density differences of p… | Expired / Lapsed | 1947-12-24 | 1949-04-12 | 0 | Details |
| US2438303A | Device for making color prints | Expired / Lapsed | 1947-02-28 | 1948-03-23 | 0 | Details |
| US2430253A | Photoelectric exposure and contrast control for enlargers | Expired / Lapsed | 1946-06-21 | 1947-11-04 | 0 | Details |
| US2430265A | Voltage supply system for amplifiers of the electron multip… | Expired / Lapsed | 1945-03-28 | 1947-11-04 | 0 | Details |
| US2415568A | Photographic enlarger | Expired / Lapsed | 1945-10-19 | 1947-02-11 | 0 | Details |
| US2414338A | Contrast control for photographic enlargers and printers | Expired / Lapsed | 1945-11-09 | 1947-01-14 | 0 | Details |
| US2399577A | Contrast control for photographic enlargers and printers | Expired / Lapsed | 1944-06-16 | 1946-04-30 | 0 | Details |
| US2338305A | Electric control switch | Expired / Lapsed | 1942-06-02 | 1944-01-04 | 0 | Details |