Pennsylvania Research Corp
PennsylvanActive Patents
0
Total Holdings
13
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US4144889A | Cardiac electrodes for temporary pacing | Expired / Lapsed | 1977-05-31 | 1979-03-20 | 21 | Details |
| US4091818A | Cardiac pacing apparatus with electromagnetic interference … | Expired / Lapsed | 1976-08-03 | 1978-05-30 | 13 | Details |
| US4026305A | Low current telemetry system for cardiac pacers | Expired / Lapsed | 1975-06-26 | 1977-05-31 | 12 | Details |
| US4014346A | Hermetically sealed cardiac pacer system and recharging sys… | Expired / Lapsed | 1975-06-26 | 1977-03-29 | 32 | Details |
| US3905981A | N-dealkylation of tertiary amines | Expired / Lapsed | 1973-10-12 | 1975-09-16 | 22 | Details |
| US3788818A | Method for growing crystals using a semipermeable membrane | Expired / Lapsed | 1971-04-22 | 1974-01-29 | 0 | Details |
| US2617874A | System for the production of a high-pressure sound field | Expired / Lapsed | 1950-02-16 | 1952-11-11 | 0 | Details |
| US2576818A | Cathode-ray polar coordinate vector plotter | Expired / Lapsed | 1948-04-10 | 1951-11-27 | 0 | Details |
| US2552722A | Electromagnetic accelerometer | Expired / Lapsed | 1948-08-09 | 1951-05-15 | 0 | Details |
| US2550771A | Magnetostriction transducer | Expired / Lapsed | 1948-07-20 | 1951-05-01 | 0 | Details |
| US2530224A | Magnetostriction transducer | Expired / Lapsed | 1949-08-02 | 1950-11-14 | 0 | Details |
| US2312707A | Carbon | Expired / Lapsed | 1941-01-17 | 1943-03-02 | 0 | Details |
| US2192863A | Electronic indicator for investigating impulses, vibrations… | Expired / Lapsed | 1937-03-12 | 1940-03-05 | 0 | Details |