Patent Explorer
Browse, filter, and analyze 6 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US3775617A | Servo apparatus with photosensitive device and compensating circuit | Lewis Engineering Co | Expired / Lapsed | 1972-08-10 | 1973-11-27 | 1992-08-10 | 0.0 yrs | 10 | |
| US2476099A | Resistance thermometer bulb | Lewis Engineering Co | Expired / Lapsed | 1947-02-26 | 1949-07-12 | 1967-02-26 | 0.0 yrs | 0 | |
| US2246884A | Potentiometer | Lewis Engineering Co | Expired / Lapsed | 1938-09-22 | 1941-06-24 | 1958-09-22 | 0.0 yrs | 0 | |
| US2230779A | Pyrometer potentiometer | Lewis Engineering Co | Expired / Lapsed | 1937-05-26 | 1941-02-04 | 1957-05-26 | 0.0 yrs | 0 | |
| US2202207A | Electric switch | Lewis Engineering Co | Expired / Lapsed | 1937-05-26 | 1940-05-28 | 1957-05-26 | 0.0 yrs | 0 | |
| US1971313A | Means for indicating and/or recording unknown quantities | Lewis Engineering Co | Expired / Lapsed | 1933-05-22 | 1934-08-21 | 1953-05-22 | 0.0 yrs | 0 |