RADIO FREQUENCY LAB Inc
RADIO FREQActive Patents
0
Total Holdings
9
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3225266A | Protective relaying circuit | Expired / Lapsed | 1962-12-19 | 1965-12-21 | 1 | Details |
| US3191071A | Variable frequency/width pulse generator | Expired / Lapsed | 1963-02-18 | 1965-06-22 | 2 | Details |
| US3037078A | Teleprinter system | Expired / Lapsed | 1960-07-20 | 1962-05-29 | 0 | Details |
| US2888558A | Frequency shift discriminator | Expired / Lapsed | 1954-11-18 | 1959-05-26 | 0 | Details |
| US2760041A | Spot welding apparatus | Expired / Lapsed | 1954-02-08 | 1956-08-21 | 0 | Details |
| US2654025A | Frequency shift teleprinter | Expired / Lapsed | 1950-12-19 | 1953-09-29 | 0 | Details |
| US2595623A | Signal generator | Expired / Lapsed | 1950-02-28 | 1952-05-06 | 0 | Details |
| US1943790A | Tuned oscillatory circuits | Expired / Lapsed | 1931-12-28 | 1934-01-16 | 0 | Details |
| US1791236A | Electrical circuit and transformer therefor | Expired / Lapsed | 1928-05-04 | 1931-02-03 | 0 | Details |