Patent US3140450A successfully refreshed from Google Patents.
US3140450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force controlled variable reactance transducer
Assignee: EDCLIFF INSTRUMENTS Inc
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Filing: 1961-02-13
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Granted: 1964-07-07
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Expires: 1981-02-13
Abstract
No abstract record available.
Inventors
- 👤 John R Tavis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:36
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/007; G01L9/10; G01L9/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A TRANSDUCER COMPRISING A HOUSING, A FORCE RESPONSIVE ELEMENT WHICH DEFLECTS IN ACCORDANCE WITH APPLIED FORCE MOUNTED IN SAID HOUSING AND DEFINING FIRST AND SECOND CHAMBERS, FIRST AND SECOND REFERENCE OSCILLATORS EACH HAVING A TUNED CIRCUIT THAT CONTROLS THE OSCILLATOR''S FREQUENCY, MEANS COUPLING THE TUNED CIRCUIT OF THE FIRST OSCILLATOR TO ONE SIDE OF THE FORCE RESPONSIVE ELEMENT FOR ALTERING THE TUNING THEREOF IN ACCORDANCE WITH DEFLECTION OF SAID FORCE RESPONSIVE ELEMENT, MEANS COUPLING THE TUNED CIRCUIT OF THE SECOND OSCILLATOR TO THE OPPOSITE SIDE OF THE FORCE RESPONSIVE ELEMENT FOR OPPOSITELY ALTERING THE TUNING THEREOF IN ACCORDANCE WITH THE SAME DEFLECTION, AND MEANS COUPLED TO THE FIRST AND SECOND OSCILLATORS FOR DERIVING AN OUTPUT SIGNAL FREQUENCY REPRESENTATIVE OF THE DIFFERENCE IN OSCILLATOR FREQUENCIES.
Claim 2
Dependent Claim
124 words
A TRANSDUCER COMPRISING A HOUSING, A FORCE RESPONSIVE ELEMENT WHICH DEFLECTS IN ACCORDANCE WITH APPLIED FORCE MOUNTED IN SAID HOUSING AND DEFINING FIRST AND SECOND CHAMBERS, FIRST AND SECOND REFERENCE OSCILLATORS EACH HAVING A TUNED CIRCUIT THAT CONTROLS THE OSCILLATOR''S FREQUENCY, MEANS COUPLING THE TUNED CIRCUIT OF THE FIRST OSCILLATOR TO ONE SIDE OF THE FORCE RESPONSIVE ELEMENT FOR ALTERING THE TUNING THEREOF IN ACCORDANCE WITH DEFLECTION OF SAID FORCE RESPONSIVE ELEMENT, MEANS COUPLING THE TUNED CIRCUIT OF THE SECOND OSCILLATOR TO THE OPPOSITE SIDE OF THE FORCE RESPONSIVE ELEMENT FOR OPPOSITELY ALTERING THE TUNING THEREOF IN ACCORDANCE WITH THE SAME DEFLECTION, AND MEANS COUPLED TO THE FIRST AND SECOND OSCILLATORS FOR DERIVING AN OUTPUT SIGNAL FREQUENCY REPRESENTATIVE OF THE DIFFERENCE IN OSCILLATOR FREQUENCIES.
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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |