Patent US3351868A successfully refreshed from Google Patents.
US3351868A
Expired / Lapsed
US
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Phase locked loop with fast frequency pull-in
Assignee: AT&T Inc
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Filing: 1966-02-02
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Granted: 1967-11-07
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Expires: 1986-02-02
Abstract
No abstract record available.
Inventors
- 👤 Cecil W Farrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:27
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/10; H03D; H03D13/00; H03D13/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A CIRCUIT FOR ADJUSTING A VOLTAGE CONTROLLED OSCILLATOR TO PROVIDE AN OUTPUT SIGNAL HAVING A FREQUENCY AND PHASE RELATED TO A RECEIVED SIGNAL COMPRISING: A COUNTDOWN CIRCUIT RESPONSIVE AT A FIRST INPUT TO SAID OUTPUT SIGNAL FOR ADVANCING SAID COUNTDOWN CIRCUIT TO PROVIDE A COUNTDOWN SIGNAL, AND AT A SECOND INPUT TO SAID RECEIVED SIGNAL TO BRING SAID COUNTDOWN CIRCUIT TO A PREDETERMINED CONDITION; AND MEANS RESPONSIVE TO THE PHASE RELATIONSHIP BETWEEN SAID RECEIVED SIGNAL AND SAID COUNTDOWN SIGNAL FOR ADJUSTIN THE FREQUENCY OF SAID VOLTAGE CONTROLLED OSCILLATOR.
Claim 2
Dependent Claim
88 words
A CIRCUIT FOR ADJUSTING A VOLTAGE CONTROLLED OSCILLATOR TO PROVIDE AN OUTPUT SIGNAL HAVING A FREQUENCY AND PHASE RELATED TO A RECEIVED SIGNAL COMPRISING: A COUNTDOWN CIRCUIT RESPONSIVE AT A FIRST INPUT TO SAID OUTPUT SIGNAL FOR ADVANCING SAID COUNTDOWN CIRCUIT TO PROVIDE A COUNTDOWN SIGNAL, AND AT A SECOND INPUT TO SAID RECEIVED SIGNAL TO BRING SAID COUNTDOWN CIRCUIT TO A PREDETERMINED CONDITION; AND MEANS RESPONSIVE TO THE PHASE RELATIONSHIP BETWEEN SAID RECEIVED SIGNAL AND SAID COUNTDOWN SIGNAL FOR ADJUSTIN THE FREQUENCY OF SAID VOLTAGE CONTROLLED OSCILLATOR.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |