US1837977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic device
Assignee: General Electric Co
•
Filing: 1923-12-31
•
Granted: 1931-12-22
•
Expires: 1943-12-31
Abstract
No abstract record available.
Inventors
- 👤 Jacob W Mcnairy
- 👤 John F Tritle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:33
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/16; H01H50/18; H01H50/30; H01H50/305
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1934-12-21 | 1935-06-22 | 1935-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-12-21 | 1939-06-22 | 1939-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-12-21 | 1943-06-22 | 1943-12-22 | $7700.00 | Window Closed / Lapsed |