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Patent US791423A successfully refreshed from Google Patents.
US791423A
Expired / Lapsed
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Alternating-current electromagnet.
Assignee: Otis Elevator Co
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Filing: 1904-12-02
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Granted: 1905-05-30
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Expires: 1924-12-02
Abstract
No abstract record available.
Inventors
- 👤 John D Hilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:19
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/10; H01F7/12
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) | 1908-05-29 | 1908-11-28 | 1909-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-05-29 | 1912-11-28 | 1913-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-05-29 | 1916-11-28 | 1917-05-30 | $7700.00 | Window Closed / Lapsed |