US2646535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical coil
Assignee: General Electric Co
•
Filing: 1949-09-28
•
Granted: 1953-07-21
•
Expires: 1969-09-28
Abstract
No abstract record available.
Inventors
- 👤 Almy D Coggeshall
- 👤 Andrew H Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:09
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/127
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1326366A
Cited
US1888275A
Cited
US2183550A
Cited
US2116318A
Cited
GB597218A
Cited
US2559141A
Cited
US2506446A
Cited
US2476455A
Cited
US2479400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |