US2631855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and reproducing
Assignee: Brush Development Co
•
Filing: 1947-09-27
•
Granted: 1953-03-17
•
Expires: 1967-09-27
Abstract
No abstract record available.
Inventors
- 👤 Kornei Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:26
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/24; G11B15/00; G11B15/18; G11B15/44; G11B15/442; G11B15/46; G11B15/48; G11B27/34
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |