US3676217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Fujifilm Holdings Corp
•
Filing: 1969-08-04
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Granted: 1972-07-11
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Expires: 1989-08-04
Abstract
Abstract MAGNETIC RECORDING MEDIUM, RESISTANT TO THE HIGH-FREQUENCY DAMPING EFFECT OF PRESSURE, COMPRISING A FEROMAGNETIC RECORDING LAYER AND A POWDERY CRO2-BASED SURFACE LAYER.
Inventors
- 👤 Goro Akashi
- 👤 Osamu Suzuki
- 👤 Matsuaki Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:31
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/716; G11B5/706; G11B5/70626; G11B5/70636
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |