Patent US3199037A successfully refreshed from Google Patents.
US3199037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase-locked loops
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1962-09-25
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Granted: 1965-08-03
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Expires: 1982-09-25
Abstract
No abstract record available.
Inventors
- 👤 Ross E Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:27
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/585; G01S13/586; H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
IN COMBINATION, A PHASE-LOCKED LOOP CIRCUIT RESPONSIVE TO A FREQUENCY VARYING INPUT SIGNAL FOR GENERATING AN OUTPUT SIGNAL HAVING SUBSTANTIALLY THE SAME INSTANTANEOUS FREQUENCY AS SAID INPUT SIGNAL, AND A PHASE CORRECTION CIRCUIT INCLUDING A PHASE SHIFTER RESPONSIVE TO SAID INPUT SIGNAL AND SAID OUTPUT SIGNAL FOR SHIFTING THE PHASE OF SAID OUTPUT SIGNAL BY MEANS OF SAID PHASE SHIFTER AN AMOUNT SUBSTANTIALLY EQUAL TO THE PHASE ERROR OF SAID FIRST LOOP.
Claim 2
Dependent Claim
72 words
IN COMBINATION, A PHASE-LOCKED LOOP CIRCUIT RESPONSIVE TO A FREQUENCY VARYING INPUT SIGNAL FOR GENERATING AN OUTPUT SIGNAL HAVING SUBSTANTIALLY THE SAME INSTANTANEOUS FREQUENCY AS SAID INPUT SIGNAL, AND A PHASE CORRECTION CIRCUIT INCLUDING A PHASE SHIFTER RESPONSIVE TO SAID INPUT SIGNAL AND SAID OUTPUT SIGNAL FOR SHIFTING THE PHASE OF SAID OUTPUT SIGNAL BY MEANS OF SAID PHASE SHIFTER AN AMOUNT SUBSTANTIALLY EQUAL TO THE PHASE ERROR OF SAID FIRST LOOP.
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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |