US3450990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency indication system
Assignee: GILFILLAN CORP
•
Filing: 1957-01-16
•
Granted: 1969-06-17
•
Expires: 1977-01-16
Abstract
No abstract record available.
Inventors
- 👤 David J Green
- 👤 Raymond B Tasker
- 👤 Donovan C Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:17
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
IN A SYSTEM FOR FREQUENCY MEASUREMENT HAVING MEANS TO REGISTER THE FREQUENCY OF AN INPUT SIGNAL IN A PREDETERMINED BAND OF INTEREST AS A FUNCTION OF THE RATIO OF THE SLOPES OF TWO SAWTOOTH VOLTAGES, THE COMBINATION COMPRISING: FIRST MEANS RESPONSIVE TO SAID INPUT SIGNAL FOR PRODUCING A FIRST CONTROL SIGNAL HAING AN AMPLITUDE PROPORTIONAL TO A FIRST FUNCTION OF THE FREQUENCY OF SAID INPUT SIGNAL, SECOND MEANS ALSO RESPONSIVE TO SAID INPUT SIGNAL FOR PRODUCING A SECOND CONTROL SIGNAL HAVING AN AMPLITUDE PROPORTIONAL TO A SECOND FUNCTION OF THE FREQUENCY OF SAID INPUT SIGNAL, THE ABSOLUTE VALUE OF THE SLOPE OF THE RATIO OF ONE OF SAID FUNCTIONS TO THE OTHER ALWAYS BEING GREATER THAN ZERO WITHIN THE LIMITS OF SAID PREDETERMINED BAND OF INTEREST EXCEPT OF A FREQUENCY FOR WHICH THE RATE OF CHANGE OF SAID SLOPE IS EQUAL TO ZERO, THIRD MEANS RESPONSIVE TO SAID FIRST CONTROL SIGNAL FOR PRODUCING A FIRST SAWTOOTH VOLTAGE HAVING A SLOPE PROPORTIONAL TO THE AMPLITUDE OF SAID FIRST CONTROL SIGNAL, AND FOURTH MEANS RESPONSIVE TO SAID SECOND CONTROL SIGNAL FOR PRODUCING A SECOND SAWTOOTH VOLTAGE HAING A SLOPE PROPORTIONAL TO THE AMPLITUDE OF SAID SECOND CONTROL SIGNAL.
Claim 2
Dependent Claim
196 words
IN A SYSTEM FOR FREQUENCY MEASUREMENT HAVING MEANS TO REGISTER THE FREQUENCY OF AN INPUT SIGNAL IN A PREDETERMINED BAND OF INTEREST AS A FUNCTION OF THE RATIO OF THE SLOPES OF TWO SAWTOOTH VOLTAGES, THE COMBINATION COMPRISING: FIRST MEANS RESPONSIVE TO SAID INPUT SIGNAL FOR PRODUCING A FIRST CONTROL SIGNAL HAING AN AMPLITUDE PROPORTIONAL TO A FIRST FUNCTION OF THE FREQUENCY OF SAID INPUT SIGNAL, SECOND MEANS ALSO RESPONSIVE TO SAID INPUT SIGNAL FOR PRODUCING A SECOND CONTROL SIGNAL HAVING AN AMPLITUDE PROPORTIONAL TO A SECOND FUNCTION OF THE FREQUENCY OF SAID INPUT SIGNAL, THE ABSOLUTE VALUE OF THE SLOPE OF THE RATIO OF ONE OF SAID FUNCTIONS TO THE OTHER ALWAYS BEING GREATER THAN ZERO WITHIN THE LIMITS OF SAID PREDETERMINED BAND OF INTEREST EXCEPT OF A FREQUENCY FOR WHICH THE RATE OF CHANGE OF SAID SLOPE IS EQUAL TO ZERO, THIRD MEANS RESPONSIVE TO SAID FIRST CONTROL SIGNAL FOR PRODUCING A FIRST SAWTOOTH VOLTAGE HAVING A SLOPE PROPORTIONAL TO THE AMPLITUDE OF SAID FIRST CONTROL SIGNAL, AND FOURTH MEANS RESPONSIVE TO SAID SECOND CONTROL SIGNAL FOR PRODUCING A SECOND SAWTOOTH VOLTAGE HAING A SLOPE PROPORTIONAL TO THE AMPLITUDE OF SAID SECOND CONTROL SIGNAL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |