US2819431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnet
Assignee: Individual
•
Filing: 1952-12-05
•
Granted: 1958-01-07
•
Expires: 1972-12-05
Abstract
No abstract record available.
Inventors
- 👤 Louis R Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:52
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/20; H01F7/202
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US513420A
Cited
CA476422A
Cited
US1394044A
Cited
US1804852A
Cited
US2141554A
Cited
US2348032A
Cited
US2469137A
Cited
US2695978A
Cited
US2664527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |