Patent Explorer
Browse, filter, and analyze 9 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US3375750A | Three axis optical alignment device | Keuffel and Esser Co | Expired / Lapsed | 1961-09-15 | 1968-04-02 | 1981-09-15 | 0.0 yrs | 1 | |
| US3116886A | Photosensitive electro-optical micrometers for rotary axles | Keuffel and Esser Co | Expired / Lapsed | 1961-08-02 | 1964-01-07 | 1981-08-02 | 0.0 yrs | 2 | |
| US3011384A | Photoelectric leveling device | Keuffel and Esser Co | Expired / Lapsed | 1957-11-22 | 1961-12-05 | 1977-11-22 | 0.0 yrs | 0 | |
| US2937570A | Telescope | Keuffel and Esser Co | Expired / Lapsed | 1957-08-29 | 1960-05-24 | 1977-08-29 | 0.0 yrs | 0 | |
| US2679181A | Optical plummet | Keuffel and Esser Co | Expired / Lapsed | 1949-07-28 | 1954-05-25 | 1969-07-28 | 0.0 yrs | 0 | |
| US2559389A | Method of producing precision images | Keuffel and Esser Co | Expired / Lapsed | 1947-12-24 | 1951-07-03 | 1967-12-24 | 0.0 yrs | 0 | |
| US2500460A | Slide rule | Keuffel and Esser Co | Expired / Lapsed | 1949-07-11 | 1950-03-14 | 1969-07-11 | 0.0 yrs | 0 | |
| US2447836A | Precision images and methods of producing them | Keuffel and Esser Co | Expired / Lapsed | 1942-04-02 | 1948-08-24 | 1962-04-02 | 0.0 yrs | 0 | |
| US1682572A | Optical instrument | Keuffel and Esser Co | Expired / Lapsed | 1925-10-15 | 1928-08-28 | 1945-10-15 | 0.0 yrs | 0 |