US3821025A
Expired / Lapsed
US
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Magnetic recording material
Assignee: Fujifilm Holdings Corp
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Filing: 1971-10-05
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Granted: 1974-06-28
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Expires: 1991-10-05
Abstract
Abstract A thermally stable magnetic recording material comprising A. A SUPPORT AND B. A MAGNETIC LAYER, SAID MAGNETIC LAYER BEING COMPOSED OF A FINELY DIVIDED POWDER OF FERROMAGNETIC MATERIAL, WHICH IS DISPERSED IN A BINDER OF A POLYAMIDE IMIDE RESIN.
Inventors
- 👤 G Akashi
- 👤 Y Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:32
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |