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Patent US3559068A successfully refreshed from Google Patents.
US3559068A
Expired / Lapsed
US
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Compression-expansion information transmission system using an fm compression pilot signal
Assignee: US Philips Corp
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Filing: 1967-09-05
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Granted: 1971-01-26
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Expires: 1987-09-05
Abstract
Abstract A COMMUNICATION SYSTEM IN WHICH THE TRANSMITTER IS PROVIDED WITH A DYNAMIC COMPRESSOR, AND THE RECEIVER IS PROVED WITH A DYNAMIC EXPANDER. THE TRANSMITTER ALSO TRANSMITS A CONTROL SIGNAL THAT IS TIME MODULATED (E.G. FREQUENCY OR PHASE) IN ACCORDANCE WITH THE COMPRESSION. THE RECEIVER INCLUDES MEANS RESPONSIVE TO THE CONTROL SIGNAL FOR CONTROLLING THE EXPANDER.
Inventors
- 👤 Petrus Cornelis Maria Almering
- 👤 Henri Jan Velo
- 👤 Johannes Anton Greefkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:34
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/68; H04J; H04J1/00; H04J1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |