US1869160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezo-electric resonator
Assignee: AT&T Inc
•
Filing: 1928-05-11
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Granted: 1932-07-26
•
Expires: 1948-05-11
Abstract
No abstract record available.
Inventors
- 👤 Warren A Marrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:32
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/02; H03H3/04; Y; Y10; Y10S; Y10S125/00; Y10S125/901; 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) | 1935-07-26 | 1936-01-25 | 1936-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-07-26 | 1940-01-25 | 1940-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-07-26 | 1944-01-25 | 1944-07-26 | $7700.00 | Window Closed / Lapsed |