US3242005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density magnetic recording medium
Assignee: Sony Corp
•
Filing: 1962-02-19
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Granted: 1966-03-22
•
Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 Morita Masaaki
- 👤 Murata Shuji
- 👤 Higuchi Shigetaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:23
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; G11B5/7022; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31576; Y10T428/3158; Y10T428/31609; Y10T428/31678; Y10T428/31681; Y10T428/31703; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A MAGNETIC RECORDING MEDIUM COMPRISING A FLEXIBLE NON-MAGNETIC CARRIER, AND A MAGNETIZABLE COATING ON SAID CARRIER, SAID COATING INCLUDING PARTICLES OF AN IRON-COBALT ALLOY CONTAINING 90 TO 20 MOL PERCENT IRON AND THE BALANCE COBALT, SAID COATING ALSO INCLUDING A PHYSICAL MIXTURE OF A VINYL CHLORIDE-VINYL ACETATE COPOLYMER AND A POLYURETHANE RESIN CONSISTING OF A POLYESTER-ISOCYANATE REACTION PRODUCT, SAID POLYURETHANE RESIN CONSTITUTING MORE THAN 30% BY WEIGHT BUT NOT MORE THAN 70% OF THE RESIN MIXTURE.
Claim 2
Dependent Claim
76 words
A MAGNETIC RECORDING MEDIUM COMPRISING A FLEXIBLE NON-MAGNETIC CARRIER, AND A MAGNETIZABLE COATING ON SAID CARRIER, SAID COATING INCLUDING PARTICLES OF AN IRON-COBALT ALLOY CONTAINING 90 TO 20 MOL PERCENT IRON AND THE BALANCE COBALT, SAID COATING ALSO INCLUDING A PHYSICAL MIXTURE OF A VINYL CHLORIDE-VINYL ACETATE COPOLYMER AND A POLYURETHANE RESIN CONSISTING OF A POLYESTER-ISOCYANATE REACTION PRODUCT, SAID POLYURETHANE RESIN CONSTITUTING MORE THAN 30% BY WEIGHT BUT NOT MORE THAN 70% OF THE RESIN MIXTURE.
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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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |