Keuffel and Esser Co
Keuffel anActive Patents
0
Total Holdings
20
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 |
| US3294542A | Photosensitive diazo compositions | Expired / Lapsed | 1964-12-21 | 1966-12-27 | 4 | Details |
| US3116886A | Photosensitive electro-optical micrometers for rotary axles | Expired / Lapsed | 1961-08-02 | 1964-01-07 | 2 | Details |
| US3041004A | Measuring tape | Expired / Lapsed | 1958-07-21 | 1962-06-26 | 0 | Details |
| US3013464A | Optical level | Expired / Lapsed | 1955-05-05 | 1961-12-19 | 0 | Details |
| US3011384A | Photoelectric leveling device | Expired / Lapsed | 1957-11-22 | 1961-12-05 | 0 | Details |
| US2994958A | Measuring tape | Expired / Lapsed | 1956-01-17 | 1961-08-08 | 0 | Details |
| US2937570A | Telescope | Expired / Lapsed | 1957-08-29 | 1960-05-24 | 0 | Details |
| US2774275A | Optical instrument | Expired / Lapsed | 1952-05-01 | 1956-12-18 | 0 | Details |
| US2679181A | Optical plummet | Expired / Lapsed | 1949-07-28 | 1954-05-25 | 0 | Details |
| US2638814A | Reflecting telescope | Expired / Lapsed | 1947-03-26 | 1953-05-19 | 0 | Details |
| US2633050A | Optical plummet | Expired / Lapsed | 1949-10-01 | 1953-03-31 | 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 |
| US2471329A | Method of making measuring tapes | Expired / Lapsed | 1948-09-04 | 1949-05-24 | 0 | Details |
| US2447836A | Precision images and methods of producing them | Expired / Lapsed | 1942-04-02 | 1948-08-24 | 0 | Details |
| US1934232A | Slide rule | Expired / Lapsed | 1932-02-11 | 1933-11-07 | 0 | Details |
| US1682572A | Optical instrument | Expired / Lapsed | 1925-10-15 | 1928-08-28 | 0 | Details |
| US1567602A | Tapeline measure | Expired / Lapsed | 1924-11-29 | 1925-12-29 | 0 | Details |
| US1137192A | Telescope. | Expired / Lapsed | 1913-02-01 | 1915-04-27 | 0 | Details |