Patent US3839369A successfully refreshed from Google Patents.
US1227904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact-bank for automatic switching devices.
Assignee: AT&T Inc
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Filing: 1916-03-23
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Granted: 1917-05-29
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Expires: 1936-03-23
Abstract
No abstract record available.
Inventors
- 👤 Charles L Goodrum
- 👤 Henry F Dobbin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:47
CPC Classifications
H; H01; H01H; H01H63/00; H01H63/02; H01H63/06; H01R; H01R9/00; H01R9/22; H01R9/24; H01R9/2458
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) | 1920-05-28 | 1920-11-27 | 1921-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-05-28 | 1924-11-27 | 1925-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-05-28 | 1928-11-27 | 1929-05-29 | $7700.00 | Window Closed / Lapsed |