US3561832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quartz resonator pressure transducer
Assignee: HP Inc
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Filing: 1969-12-05
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Granted: 1971-02-09
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Expires: 1989-12-05
Abstract
Abstract A PRESSURE TRANSDUCER USES A PRECISION PIEZOELECTRIC QUARTZ RESONATOR THAT EXHIBITS LINEAR CHANGES IN FREQUENCY WHEN SUBJECTED TO RADIAL COMPRESSIVE STRESSES. A CYLINDRICAL QUARTZ TUBE IN INTEGRAL WITH THE CIRCULAR RESONATOR AND ACTS AS A DIAPHRAGM WHICH TRANSFERS AND CONCENTRATES THE STRESS FROM THE APPLIED PRESSURE ONTO THE PERIPHERY OF THE RESONATOR. THE TUBE AND RESONATOR ARE FABRICATED FROM A SINGLE QUARTZ CRYSTAL TO MINIMIZE NONELASTIC EFFECTS.
Inventors
- 👤 Henry E Karrer
- 👤 Jerry G Leach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:43
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0001; G01L9/0008; G01L9/0022; E; E21; E21B; E21B47/00; E21B47/06; G01L19/00; G01L19/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |