Patent US3553602A successfully refreshed from Google Patents.
US3553602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature stabilized piezoelectric crystal transducer and oscillator
Assignee: Applied Biosystems Inc
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Filing: 1968-06-27
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Granted: 1971-01-05
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Expires: 1988-06-27
Abstract
Abstract A CRYSTAL TRANSDUCER AND AN OSCILLATOR CIRCUIT IS DISCLOSED IN WHICH A TEMPERATURE GRADIENT IS APPLIED BETWEEN THE CRYSTAL FACES. ONE FACE IS HELD AT A PREDETERMINED REFERENCE TEMPERATURE WHILE THE TEMPERATURE OF THE OTHER FACE VARIES WITH THE ENVIRONMENT TO WHICH IT IS EXPOSED. FOR THIS ARRANGEMENT A LINEAR RELATIONSHIP EXISTS BETWEEN THE TEMPERATURE GRADIENT AND THE NATURAL RESONANCE OF THE CRYSTAL. APPLICATIONS AS TEMPERATURE SNSOR, MICROBALANCES AND PARTICULAR MODES OF OPERATING THE TRANSDUCER ARE DISCLOSED.
Inventors
- 👤 Charles F Brothers
- 👤 Thomas R Parkhill
- 👤 Norman E Rosinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:17
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/02; G01B7/06; G01B7/063; G01B7/066; G01K; G01K7/00; G01K7/32
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |