Patent Explorer
Browse, filter, and analyze 2 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US2221591A | Frequency measuring apparatus | The Echlin Manufacturing Co | Expired / Lapsed | 1939-05-01 | 1940-11-12 | 1959-05-01 | 0.0 yrs | 0 | |
| US2161146A | Apparatus for measuring frequency | The Echlin Manufacturing Co | Expired / Lapsed | 1936-08-15 | 1939-06-06 | 1956-08-15 | 0.0 yrs | 0 |