Hilbert; Francis H.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hilbert; Francis H..The latest application filed is for "compatible am stereophonic system".
- Hilbert; Francis H. - Addison IL
- Hilbert; Francis H. - River Grove IL
| Patent | Date |
|---|---|
| Compatible AM stereophonic system Grant 4,338,491 - Parker , et al. July 6, 1 | 1982-07-06 |
| Compatible AM stereo broadcast system Grant 4,218,586 - Parker , et al. August 19, 1 | 1980-08-19 |
| AM stereophonic receiver Grant 4,172,966 - Parker , et al. October 30, 1 | 1979-10-30 |
| Stereo presence signal for an AM stereo system Grant 4,159,398 - Hilbert , et al. June 26, 1 | 1979-06-26 |
| Auxiliary signal processing circuit for television receivers Grant 4,051,532 - Hilbert , et al. September 27, 1 | 1977-09-27 |
| Noise Processing Circuit For A Television Receiver Grant 3,878,325 - Cecchin , et al. April 15, 1 | 1975-04-15 |
| Multi-channel control circuit with D-C operated control devices Grant 3,875,334 - Hilbert , et al. April 1, 1 | 1975-04-01 |
| Counter Circuit Using Current Source Grant 3,819,955 - Hilbert June 25, 1 | 1974-06-25 |
| Signal Processing Circuit For A Color Television Receiver Grant 3,781,701 - Cecchin , et al. December 25, 1 | 1973-12-25 |
| Gain Modified Multi-channel Audio System Grant 3,772,479 - Hilbert November 13, 1 | 1973-11-13 |
| Frequency Multiplying Circuit Utilizing Time Gates And Switching Signals Of Differing Phases Grant 3,721,766 - Hilbert March 20, 1 | 1973-03-20 |
| Signal Reconstruction Circuit Grant 3,652,950 - Hilbert March 28, 1 | 1972-03-28 |
| Signal Demodulating System Grant 3,644,677 - Cecchin , et al. February 22, 1 | 1972-02-22 |
| Modulator Circuit Having Utility In Video Recording Grant 3,622,693 - Del Ciello , et al. November 23, 1 | 1971-11-23 |
| Stereo Multiplex Demodulator Grant 3,617,641 - Fiet , et al. November 2, 1 | 1971-11-02 |
| A Stereophonic Receiver Muting Means With Substitution Of A Dc Circuit For An Ac Circuit Grant 3,573,382 - Feit , et al. April 6, 1 | 1971-04-06 |
| Color Television Signal Demodulation System Grant 3,558,810 - Cecchin , et al. January 26, 1 | 1971-01-26 |
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