Issued Patents All Time
Showing 51–75 of 78 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4714847 | Advanced piezoeceramic power switching devices employing protective gastight enclosure and method of manufacture | John D. Harnden, Jr., George A. Farrall | 1987-12-22 |
| 4697118 | Piezoelectric switch | John D. Harnden, Jr., James E. Kohl, Michael Adler | 1987-09-29 |
| 4689517 | Advanced piezoceramic power switching devices employing protective gastight enclosure and method of manufacture | John D. Harnden, Jr., George A. Farrall | 1987-08-25 |
| 4680840 | Method for prepolarizing and centering a piezoceramic power switching device | John D. Harnden, Jr., George A. Farrall | 1987-07-21 |
| 4678957 | Piezoelectric ceramic switching devices and systems and methods of making the same | John D. Harnden, Jr. | 1987-07-07 |
| 4669160 | Method for prepolarizing and centering a piezoelectric ceramic switching device | John D. Harnden, Jr. | 1987-06-02 |
| 4670682 | Piezoelectric ceramic switching devices and systems and method of making the same | John D. Harnden, Jr. | 1987-06-02 |
| 4658154 | Piezoelectric relay switching circuit | John D. Harnden, Jr. | 1987-04-14 |
| 4642745 | Power circuit with high input power factor and a regulated output | Robert Louis Steigerwald | 1987-02-10 |
| 4626698 | Zero crossing synchronous AC switching circuits employing piezoceramic bender-type switching devices | John D. Harnden, Jr., George A. Farrall | 1986-12-02 |
| 4621503 | Pressure sensing devices and methods, control devices and methods of operating same, smart pressure switches, air conditioning systems and devices for controlling same | Lee O. Woods, Ronald L. Hilty | 1986-11-11 |
| 4561261 | Control apparatus and methods, heat transfer systems and apparatus and methods for controlling such systems and for sensing and indicating low fluid charge conditions therein | William J. Laughton | 1985-12-31 |
| 4561314 | Magnetoelastic force/pressure sensor | Robert P. Alley, John D. Harnden, Jr. | 1985-12-31 |
| 4559496 | LCD Hook-on digital ammeter | John D. Harnden, Jr. | 1985-12-17 |
| 4541288 | Operating circuit for magnetoelastic force/pressure sensors | Robert P. Alley | 1985-09-17 |
| 4489234 | Radiant-energy heating and/or cooking apparatus with honeycomb coverplate | John D. Harnden, Jr., Fred F. Holub | 1984-12-18 |
| 4471300 | LDC Hook-on digital ammeter | John D. Harnden, Jr. | 1984-09-11 |
| 4447764 | Power supply for low-voltage incandescent lamp and like load | Paul T. Cote | 1984-05-08 |
| 4438396 | Low cost volt/ampere meter with liquid crystal display | John D. Harnden, Jr. | 1984-03-20 |
| 4426564 | Parallel resonant induction cooking surface unit | Robert Louis Steigerwald, John P. Walden | 1984-01-17 |
| 4422138 | Power supply for low-voltage load | — | 1983-12-20 |
| 4392171 | Power relay with assisted commutation | — | 1983-07-05 |
| 4360847 | Diode assisted relay contactor | Milton D. Bloomer, Joseph L. Ciccone, John D. Harnden, Jr., Donald Shattuck | 1982-11-23 |
| 4356525 | Method and circuit for controlling a hybrid contactor | Joseph L. Ciccone | 1982-10-26 |
| 4318165 | Resonant-flyback power supply with filament winding for magnetron and the like loads | John Norton Park, De-Yu Chen | 1982-03-02 |