US2705392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of piezo electric crystals
Assignee: Selectronics Inc
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Filing: 1952-06-11
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Granted: 1955-04-05
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Expires: 1972-06-11
Abstract
No abstract record available.
Inventors
- 👤 Donald I Imler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:56
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/08; H10N30/085; H10N30/086; H10N30/082; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
53 words
THE METHOD OF MANUFACTURING PIEZOELECTRIC QUARTZ CRYSTALS WHICH COMPRISES PRODUCING A ROUGN BLANK QUARTZ PLATE PROPORTIONED TO RESPOND WHEN FINISH GROUND TO A FREQUENCY RANGE ABOVE 20 MEGACYCLES AND SUBJECTING SAID BLANK PLATE TO SUCCESSIVE ALTERNATE STAGES OF GRINDING AND ETCHING FOR PRODUCING A FINISHED CRYSTAL HAVING A FREQUENCY RANGE ABOVE 20 MEGACYLCES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-04 | 1958-10-04 | 1959-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-04 | 1962-10-04 | 1963-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-04 | 1966-10-04 | 1967-04-05 | $7700.00 | Window Closed / Lapsed |