US2976604A
Expired / Lapsed
US
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Measurement of piezoelectric crystal characteristics
Assignee: Research Corp
•
Filing: 1956-04-13
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Granted: 1961-03-28
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Expires: 1976-04-13
Abstract
No abstract record available.
Inventors
- 👤 David I Kosowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:47
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/0023; H03H9/0095; H03H9/46; H03H9/54; H03H9/545; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49004; Y10T29/49764; Y10T29/49771
Claims Analysis
Total Claims: 0
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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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |