SPENCER LENS CO
SPENCER LEActive Patents
0
Total Holdings
10
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2366687A | Means for decreasing light reflection from surfaces | Expired / Lapsed | 1941-01-23 | 1945-01-02 | 0 | Details |
| US2351537A | Apparatus for treating surfaces | Expired / Lapsed | 1942-03-05 | 1944-06-13 | 0 | Details |
| US2351539A | Polarimeter apparatus | Expired / Lapsed | 1941-12-04 | 1944-06-13 | 0 | Details |
| US2349457A | Vertical illuminator for microscopes | Expired / Lapsed | 1941-01-02 | 1944-05-23 | 0 | Details |
| US2330663A | Telescope objective and method of making same | Expired / Lapsed | 1940-09-12 | 1943-09-28 | 0 | Details |
| US2281988A | Ventilating device for projection apparatus | Expired / Lapsed | 1940-05-21 | 1942-05-05 | 0 | Details |
| US2232008A | Microtome blade holder | Expired / Lapsed | 1939-01-20 | 1941-02-18 | 0 | Details |
| US1994483A | Optical article and method of making same | Expired / Lapsed | 1932-10-13 | 1935-03-19 | 0 | Details |
| US1891052A | Adjusting mechanism for microscope stages and the like | Expired / Lapsed | 1930-05-29 | 1932-12-13 | 0 | Details |
| US1797694A | Microtome | Expired / Lapsed | 1929-08-29 | 1931-03-24 | 0 | Details |