Patent US3387993A successfully refreshed from Google Patents.
US3387993A
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US
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Magnetic tape with a lubricant containing mineral oil and fatty acid amide in the magnetic coating
Assignee: Ampex Corp
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Filing: 1964-10-16
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Granted: 1968-06-11
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Expires: 1984-10-16
Abstract
No abstract record available.
Inventors
- 👤 Dervin L Flowers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73937; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31844; Y10T428/31848; Y10T428/31851
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2734033A
Cited
US1344645A
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US2345632A
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US3017297A
Cited
US3188226A
Cited
US3274111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |