US3143672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single crystal quartz filter elements, oscillators and transducers
Assignee: AT&T Inc
•
Filing: 1962-09-14
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Granted: 1964-08-04
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Expires: 1982-09-14
Abstract
No abstract record available.
Inventors
- 👤 Warren P Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:09
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03H9/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
AN ELONGATED ELEMENT CUT FROM A SINGLE CRYSTAL OF QUARTZ ADAPTED AND ARRANGED TO VIBRATE IN A PRINCIPAL HIGH FREQUENCY THICKNESS SHEAR MODE, THE SAID MODE HAVING IN AN ELEMENT OF RECTANGULAR SHAPE APPRECIABLE COUPLYING TO A PARTICULAR LONGITUDINAL HIGHER ORDER EVEN FLEXURE MODE AND EVEN FLEXURE MODES ADJACENT SAID PARTICULAR MODE, EACH OF THE ENDS OF THE ELEMENT HAVING THE SHAPE OF AN INWARDLY PROJECTING V-SHAPED NOTCH, THE APEX OF THE NOTCH EXTENDING INTO THE ELEMENT FOR A DEPTH OF TWO WAVELENGTHS OF THE PARTICULAR FLEXURE MODE, THE BASE OF THE NOTCH BEING EQUAL TO THE WIDTH OF THE ELEMENT AND COINCIDENT WITH ITS ASSOCIATED END OF THE ELEMENT.
Claim 2
Dependent Claim
110 words
AN ELONGATED ELEMENT CUT FROM A SINGLE CRYSTAL OF QUARTZ ADAPTED AND ARRANGED TO VIBRATE IN A PRINCIPAL HIGH FREQUENCY THICKNESS SHEAR MODE, THE SAID MODE HAVING IN AN ELEMENT OF RECTANGULAR SHAPE APPRECIABLE COUPLYING TO A PARTICULAR LONGITUDINAL HIGHER ORDER EVEN FLEXURE MODE AND EVEN FLEXURE MODES ADJACENT SAID PARTICULAR MODE, EACH OF THE ENDS OF THE ELEMENT HAVING THE SHAPE OF AN INWARDLY PROJECTING V-SHAPED NOTCH, THE APEX OF THE NOTCH EXTENDING INTO THE ELEMENT FOR A DEPTH OF TWO WAVELENGTHS OF THE PARTICULAR FLEXURE MODE, THE BASE OF THE NOTCH BEING EQUAL TO THE WIDTH OF THE ELEMENT AND COINCIDENT WITH ITS ASSOCIATED END OF THE ELEMENT.
References Cited (Backward Citations)
US2967958A
Cited
US3020424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |