US2535481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demagnetizing apparatus for magnetic recorders
Assignee: Brush Development Co
•
Filing: 1946-10-15
•
Granted: 1950-12-26
•
Expires: 1966-10-15
Abstract
No abstract record available.
Inventors
- 👤 Begun Semi Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:46
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/027; G11B5/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1837586A
Cited
FR691711A
Cited
US2230913A
Cited
DE693664C
Cited
US2344438A
Cited
US2210770A
Cited
US2288862A
Cited
US2351004A
Cited
US2351007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |