Patent Explorer
Browse, filter, and analyze 4 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US2479907A | Optical objective having a front member correcting spherical aberration, field curvature, and distortion | Taylor Taylor and Hobson Ltd | Expired / Lapsed | 1946-05-31 | 1949-08-23 | 1966-05-31 | 0.0 yrs | 0 | |
| US2471009A | Apparatus for measuring or indicating the roughness or undulations of surfaces | Taylor Taylor and Hobson Ltd | Expired / Lapsed | 1944-08-15 | 1949-05-24 | 1964-08-15 | 0.0 yrs | 0 | |
| US2441549A | Copying machine | Taylor Taylor and Hobson Ltd | Expired / Lapsed | 1946-04-05 | 1948-05-11 | 1966-04-05 | 0.0 yrs | 0 | |
| US2380888A | Optical objective | Taylor Taylor and Hobson Ltd | Expired / Lapsed | 1942-06-30 | 1945-07-31 | 1962-06-30 | 0.0 yrs | 0 |