US1802781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezo-electric device
Assignee: Cleveland Trust Co
•
Filing: 1927-05-06
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Granted: 1931-04-28
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Expires: 1947-05-06
Abstract
No abstract record available.
Inventors
- 👤 Charles B Sawyer
- 👤 Company The Cleveland Trust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:51
CPC Classifications
H; H04; H04R; H04R17/00
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) | 1934-04-27 | 1934-10-27 | 1935-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-04-27 | 1938-10-27 | 1939-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-04-27 | 1942-10-27 | 1943-04-28 | $7700.00 | Window Closed / Lapsed |