Patent US1707544A successfully refreshed from Google Patents.
US1707544A
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US
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Electrodynamic device
Assignee: AT&T Inc
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Filing: 1926-08-04
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Granted: 1929-04-02
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Expires: 1946-08-04
Abstract
No abstract record available.
Inventors
- 👤 Albert L Thuras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:57
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/06; H04R9/02; H04R9/022
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) | 1932-04-01 | 1932-10-01 | 1933-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-04-01 | 1936-10-01 | 1937-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-04-01 | 1940-10-01 | 1941-04-02 | $7700.00 | Window Closed / Lapsed |