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Patent US1345717A successfully refreshed from Google Patents.
US1345717A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic device
Assignee: AT&T Inc
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Filing: 1918-08-09
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Granted: 1920-07-06
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Expires: 1938-08-09
Abstract
No abstract record available.
Inventors
- 👤 George B Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:47
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/004
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) | 1923-07-06 | 1924-01-05 | 1924-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-07-06 | 1928-01-05 | 1928-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-07-06 | 1932-01-05 | 1932-07-06 | $7700.00 | Window Closed / Lapsed |