Patent US3409787A successfully refreshed from Google Patents.
US3409787A
Expired / Lapsed
US
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Piezoelectric transducer system
Assignee: United States Department of the Air Force
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Filing: 1966-11-15
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Granted: 1968-11-05
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Expires: 1986-11-15
Abstract
No abstract record available.
Inventors
- 👤 Agalides Eugene
- 👤 Leslie C Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:51
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/023; G; G01; G01R; G01R29/00; G01R29/22; B06B2201/00; B06B2201/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A SYSTEM FOR STRESSING A PIEZOELECTRIC ELEMENT TO PREVIDE A MECHANICAL DISPLACEMENT OUTPUT COMPRISING: A PIEZOELECTRIC ELEMENT HAVING ELECTRICAL-ENERGY RECEIVING INPUT TERMINALS, AMPLIFIER MEANS COUPLED TO SAID INPUT TERMINALS FOR ELECTRICALLY DRIVING SAID ELEMENT TO CAUSE ITS MECHANICAL DISPLACEMENT BY ENERGIZING SAID INPUT TERMINALS, MEANS FOR MEASURING THE DISPLACEMENT OF SAID ELEMENT FROM A STATIC POSITION, EQUIVALENT NETWORK MEANS CONNECTED TO THE INPUT OF SAID AMPLIFIER MEANS AND HAVING THE CHARACTERISTICS OF A ZERO AT THE SAME FREQUENCY AS THE POLE OF THE EQUIVALENT CIRCUIT OF SAID ELEMENT, SAID EQUIVALENT NETWORK MEANS INCLUDING ADJUSTABLE MEANS FOR DAMPING THE RINGING OF SAID PIEZOELECTRIC ELEMENT, AND SOURCE MEANS COUPLED TO SAID EQUIVALENT NETWORK MEANS FOR INTRODUCING AN ELECTRICAL SIGNAL PROPORTIONAL TO THE PHYSICAL QUANTITY TO BE MEASURED.
Claim 2
Independent Claim
125 words
A SYSTEM FOR STRESSING A PIEZOELECTRIC ELEMENT TO PREVIDE A MECHANICAL DISPLACEMENT OUTPUT COMPRISING: A PIEZOELECTRIC ELEMENT HAVING ELECTRICAL-ENERGY RECEIVING INPUT TERMINALS, AMPLIFIER MEANS COUPLED TO SAID INPUT TERMINALS FOR ELECTRICALLY DRIVING SAID ELEMENT TO CAUSE ITS MECHANICAL DISPLACEMENT BY ENERGIZING SAID INPUT TERMINALS, MEANS FOR MEASURING THE DISPLACEMENT OF SAID ELEMENT FROM A STATIC POSITION, EQUIVALENT NETWORK MEANS CONNECTED TO THE INPUT OF SAID AMPLIFIER MEANS AND HAVING THE CHARACTERISTICS OF A ZERO AT THE SAME FREQUENCY AS THE POLE OF THE EQUIVALENT CIRCUIT OF SAID ELEMENT, SAID EQUIVALENT NETWORK MEANS INCLUDING ADJUSTABLE MEANS FOR DAMPING THE RINGING OF SAID PIEZOELECTRIC ELEMENT, AND SOURCE MEANS COUPLED TO SAID EQUIVALENT NETWORK MEANS FOR INTRODUCING AN ELECTRICAL SIGNAL PROPORTIONAL TO THE PHYSICAL QUANTITY TO BE MEASURED.
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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) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |