Keuffel and Esser Co
Keuffel anActive Patents
0
Total Holdings
9
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3375750A | Three axis optical alignment device | Expired / Lapsed | 1961-09-15 | 1968-04-02 | 1 | Details |
| US3116886A | Photosensitive electro-optical micrometers for rotary axles | Expired / Lapsed | 1961-08-02 | 1964-01-07 | 2 | Details |
| US3011384A | Photoelectric leveling device | Expired / Lapsed | 1957-11-22 | 1961-12-05 | 0 | Details |
| US2937570A | Telescope | Expired / Lapsed | 1957-08-29 | 1960-05-24 | 0 | Details |
| US2679181A | Optical plummet | Expired / Lapsed | 1949-07-28 | 1954-05-25 | 0 | Details |
| US2559389A | Method of producing precision images | Expired / Lapsed | 1947-12-24 | 1951-07-03 | 0 | Details |
| US2500460A | Slide rule | Expired / Lapsed | 1949-07-11 | 1950-03-14 | 0 | Details |
| US2447836A | Precision images and methods of producing them | Expired / Lapsed | 1942-04-02 | 1948-08-24 | 0 | Details |
| US1682572A | Optical instrument | Expired / Lapsed | 1925-10-15 | 1928-08-28 | 0 | Details |