US2821576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape apparatus
Assignee: Individual
•
Filing: 1954-10-22
•
Granted: 1958-01-28
•
Expires: 1974-10-22
Abstract
No abstract record available.
Inventors
- 👤 Rene J Gaubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
G; G11; G11B; G11B25/00; G11B25/06; G11B15/00; G11B15/675; G11B15/68; G11B15/6895; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2214468A
Cited
US2507385A
Cited
US2481398A
Cited
US2676212A
Cited
US2488482A
Cited
US2650830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |