US3507435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed changer for capstan and rotating head in a tape recorder
Assignee: Ampex Corp
•
Filing: 1966-11-21
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Granted: 1970-04-21
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Expires: 1986-11-21
Abstract
No abstract record available.
Inventors
- 👤 Richard A Hathaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:16
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; F; F16; F16H; F16H9/00; F16H9/02; F16H9/04; F16H9/22; G11B15/1808
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |