Patent US2820632A successfully refreshed from Google Patents.
US2820632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
De-magnetizer for magnetic feed system
Assignee: Individual
•
Filing: 1953-06-04
•
Granted: 1958-01-21
•
Expires: 1973-06-04
Abstract
No abstract record available.
Inventors
- 👤 Fowler Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:53
CPC Classifications
H; H01; H01F; H01F13/00; H01F13/006
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1824403A
Cited
US2207392A
Cited
US2306584A
Cited
US2460684A
Cited
US2403424A
Cited
US2650824A
Cited
US2661208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |