Patent US2641655A successfully refreshed from Google Patents.
US2641655A
Expired / Lapsed
US
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Magnetic recording and reproducing circuits
Assignee: Int Electronics Co
•
Filing: 1947-11-24
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Granted: 1953-06-09
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Expires: 1967-11-24
Abstract
No abstract record available.
Inventors
- 👤 Lloyd J Bobb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:40
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/0007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1933306A
Cited
US2341009A
Cited
US2204975A
Cited
US2235132A
Cited
FR880550A
Cited
US2351004A
Cited
US2418541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |