US3002671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape apparatus
Assignee: Ampex Corp
•
Filing: 1958-10-22
•
Granted: 1961-10-03
•
Expires: 1978-10-22
Abstract
No abstract record available.
Inventors
- 👤 Robert M Brumbaugh
- 👤 Walter J Cheney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:02
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/56; G11B15/58; G06; G06K; G06K13/00; G06K13/18; G06K13/20; G06K13/22; G11B15/18; G11B15/22; G11B15/26; G11B15/28; G11B15/29; G11B15/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2321618A
Cited
US2617864A
Cited
US2745604A
Cited
US2924757A
Cited
US2838250A
Cited
US2877012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |