US3487392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incremental web member drive system
Assignee: Ampex Corp
•
Filing: 1967-06-12
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Granted: 1969-12-30
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Expires: 1987-06-12
Abstract
No abstract record available.
Inventors
- 👤 Martyn A Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:47
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; G; G11; G11B; G11B15/00; G11B15/18; G11B15/20; G11B15/56; G11B15/58; H02P7/03; H02P7/04; H02P7/288; H02P7/2885
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) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |