Patent US4259016B1 successfully refreshed from Google Patents.
Patent US3564419A successfully refreshed from Google Patents.
US3564419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse counting squelch circuit
Assignee: Motorola Solutions Inc
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Filing: 1969-03-10
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Granted: 1971-02-16
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Expires: 1989-03-10
Abstract
Abstract THE RANDOM DISTRIBUTION OF ZERO AXIS CROSSING OF NOISE AS COMPARED WITH THE REGULAR ZERO AXIS CROSSING OF A DESIRED SIGNAL IS USED TO DETERMINE THAT THE SIGNAL IS BEING RECEIVED. ZERO AXIS CROSSINGS IN A FIRST DIRECTION ARE COUPLED THROUGH A GATE TO A COUNTER TO BE COUNTED THEREBY. ZERO AXIS CROSSINGS IN THE OTHER DIRECTION ARE USED TO CLOSE THE GATE TO PREVENT THE COUNTING OF THE ZERO AXIS CROSSINGS IN THE FIRST DIRECTION FOR A PREDETERMINED PERIOD OF TIMES AFTER A ZERO AXIS CROSSING IN THE SECOND DIRECTION. BY PROPERLY CHOOSING THE PREDETERMINED TIME PERIOD THE PROBABILITY IS VERY HIGH THAT ONLY NOISE PULSES WILL BE COUNTED.
Inventors
- 👤 Thomas M Yackish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:06
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/34; H03G3/342
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |