Patent US3634253A successfully refreshed from Google Patents.
US3634253A
Expired / Lapsed
US
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Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1970-08-31
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Granted: 1972-01-11
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Expires: 1990-08-31
Abstract
Abstract A MAGNETIC RECORDING MEDIUM HAVING EXCELLENT FREQUENCY CHARACTERISTICS AND PREVENTING CREAKING PHENOMENA, HAVING A MAGNETIC RECORDING LAYER CONSISTING OF A POWDERED MGNETIC RECORDING MATERIAL DISPERSED IN A RESINOUS BINDER, CHARACTERIZED BY THE ADDITION TO SAID BINDER OF A MONOBASIC ACID SELECTED FROM THE GROUP CONSISTING OF LINOLEIC ACID, LINOLENIC ACID, CAPRYLIC ACID, CAPRIC ACID AND LAURIC ACID, IN A PROPORTION OF FROM ABOUT 0.5 TO 10 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF SAID MAGNETIC MATERIAL IS DICLOSED.
Inventors
- 👤 Goro Akashi
- 👤 Masaaki Fujiyama
- 👤 Takashi Hirakawa
- 👤 Osamu Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:14
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; G11B5/702; G11B5/7028; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31826; Y10T428/31841; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31891; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31986
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |