Patent US2509471A successfully refreshed from Google Patents.
US1766037A
Expired / Lapsed
US
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Piezo-electric crystal apparatus
Assignee: Federal Telegraph Co
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Filing: 1927-03-25
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Granted: 1930-06-24
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Expires: 1947-03-25
Abstract
No abstract record available.
Inventors
- 👤 Leo H Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:09
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/08; H10N30/085; H10N30/088; Y; Y10; Y10T; Y10T29/00; Y10T29/42
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) | 1933-06-23 | 1933-12-23 | 1934-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-06-23 | 1937-12-23 | 1938-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-06-23 | 1941-12-23 | 1942-06-24 | $7700.00 | Window Closed / Lapsed |