Lewis Engineering Co
Lewis EngiActive Patents
0
Total Holdings
6
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3775617A | Servo apparatus with photosensitive device and compensating… | Expired / Lapsed | 1972-08-10 | 1973-11-27 | 10 | Details |
| US2476099A | Resistance thermometer bulb | Expired / Lapsed | 1947-02-26 | 1949-07-12 | 0 | Details |
| US2246884A | Potentiometer | Expired / Lapsed | 1938-09-22 | 1941-06-24 | 0 | Details |
| US2230779A | Pyrometer potentiometer | Expired / Lapsed | 1937-05-26 | 1941-02-04 | 0 | Details |
| US2202207A | Electric switch | Expired / Lapsed | 1937-05-26 | 1940-05-28 | 0 | Details |
| US1971313A | Means for indicating and/or recording unknown quantities | Expired / Lapsed | 1933-05-22 | 1934-08-21 | 0 | Details |