Patent US3743869A successfully refreshed from Google Patents.
US3743869A
Expired / Lapsed
US
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Transducer with ground isolation
Assignee: Kistler Instrument Corp
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Filing: 1971-03-03
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Granted: 1973-07-03
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Expires: 1991-03-03
Abstract
Abstract Disclosed is a piezoelectric transducer which is isolated from ground by a rigid metallic insulator to improve the high frequency response of the transducer. The insulator takes the form of an aluminum or aluminum alloy ring or sleeve that is coated with an aluminum oxide. The oxide coating is electrically insulating but hard and rigid to provide a rigid mount for the transducer making it useful at frequencies up close to its natural resonant frequency.
Inventors
- 👤 H Hugli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:26
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/008; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01P15/0907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |