Patent US5525648A successfully refreshed from Google Patents.
US3558353A
Expired / Lapsed
US
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Magnetic recording medium
Assignee: Nippon Columbia Co Ltd
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Filing: 1967-08-23
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Granted: 1971-01-26
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Expires: 1987-08-23
Abstract
Abstract A MAGNETIC RECORDING MEDIUM HAVING A NON-MAGNETIC BASE AND A MAGNETIC PAINT COATED THEREON, THE MAGNETIC PAINT CONSISTING OF A POWDERED MAGNETIC MATERIAL, A MIXTURE OF A POLYESTER RESIN HAVING A REACTIVE HYDROXYL GROUP AND A POLYURETHANE PREPOLYMER INCLUDING AN ISOCYANATE GROUP REACTIVE WITH THE HYDROXYL GROUP AND A RUBBER MATERIAL YIELDING AN EFFECT CORRESPONDING TO A VULCANIZING EFFECT BY REACTION WITH THE MAKING UP THE MIXTURE.
Inventors
- 👤 Shigehisa Harada
- 👤 Terumi Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:02
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31565; Y10T428/31609
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |