Patent US2039625A successfully refreshed from Google Patents.
US2039625A
Expired / Lapsed
US
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Acoustic device
Assignee: AT&T Inc
•
Filing: 1934-07-13
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Granted: 1936-05-05
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Expires: 1954-07-13
Abstract
No abstract record available.
Inventors
- 👤 Blount Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:39
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/03; Y; Y10; Y10S; Y10S425/00; Y10S425/056
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) | 1939-05-05 | 1939-11-04 | 1940-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-05-05 | 1943-11-04 | 1944-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-05-05 | 1947-11-04 | 1948-05-05 | $7700.00 | Window Closed / Lapsed |