Patent US3320552A successfully refreshed from Google Patents.
US3320552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Band limited frequency modulation system
Assignee: Motorola Solutions Inc
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Filing: 1964-06-03
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Granted: 1967-05-16
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Expires: 1984-06-03
Abstract
No abstract record available.
Inventors
- 👤 James R Glasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A SYSTEM FOR LIMITING THE BANDWIDTH OF AN ANGULAR MODULATED SIGNAL, INCLUDING IN COMBINATION, OSCILLATOR MEANS FOR PRODUCING FIRST AND SECOND PAIRS OF QUADRATURE CARRIER SIGNALS, ANGULAR MODULATION MEANS COUPLED TO SAID OSCILLATOR MEANS AND ADAPTED TO RECEIVE A MODULATING SIGNAL, SAID ANGULAR MODULATION MEANS BEING RESPONSIVE TO SAID MODULATING SIGNAL AND TO ONE OF SAID FIRST PAIR OF QUADRATURE CARRIER SIGNALS TO PRODUCE AN ANGULAR MODULATED SIGNAL, A PAIR OF PRODUCT DETECTOR MEANS COUPLED TO SAID ANGULAR MODULATION MEANS, CIRCUIT MEANS COUPLING EACH OF SAID PRODUCT DETECTOR MEANS TO SAID OSCILLATOR MEANS, EACH OF SAID PRODUCT DETECTOR MEANS BEING RESPONSIVE TO SAID ANGULAR MODULATED SIGNAL AND TO A SEPARATE ONE OF SAID FIRST PAIR OF QUADRATURE CARRIER SIGNALS TO PRODUCE A TRIGONOMETRIC FUNCTION SIGNAL, A PAIR OF PRODUCT MODULATOR MEANS COUPLED TO SAID OSCILLATOR
Claim 2
Independent Claim
135 words
A SYSTEM FOR LIMITING THE BANDWIDTH OF AN ANGULAR MODULATED SIGNAL, INCLUDING IN COMBINATION, OSCILLATOR MEANS FOR PRODUCING FIRST AND SECOND PAIRS OF QUADRATURE CARRIER SIGNALS, ANGULAR MODULATION MEANS COUPLED TO SAID OSCILLATOR MEANS AND ADAPTED TO RECEIVE A MODULATING SIGNAL, SAID ANGULAR MODULATION MEANS BEING RESPONSIVE TO SAID MODULATING SIGNAL AND TO ONE OF SAID FIRST PAIR OF QUADRATURE CARRIER SIGNALS TO PRODUCE AN ANGULAR MODULATED SIGNAL, A PAIR OF PRODUCT DETECTOR MEANS COUPLED TO SAID ANGULAR MODULATION MEANS, CIRCUIT MEANS COUPLING EACH OF SAID PRODUCT DETECTOR MEANS TO SAID OSCILLATOR MEANS, EACH OF SAID PRODUCT DETECTOR MEANS BEING RESPONSIVE TO SAID ANGULAR MODULATED SIGNAL AND TO A SEPARATE ONE OF SAID FIRST PAIR OF QUADRATURE CARRIER SIGNALS TO PRODUCE A TRIGONOMETRIC FUNCTION SIGNAL, A PAIR OF PRODUCT MODULATOR MEANS COUPLED TO SAID OSCILLATOR
References Cited (Backward Citations)
US2624041A
Cited
US3253223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |