Patent US3149995A successfully refreshed from Google Patents.
US3149995A
Expired / Lapsed
US
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Magnetic recording element and method of preparation thereof
Assignee: RCA Corp
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Filing: 1961-06-13
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Granted: 1964-09-22
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Expires: 1981-06-13
Abstract
No abstract record available.
Inventors
- 👤 Bauer Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; G11B5/7022; C; C08; C08L; C08L29/00; C08L29/02; C08L29/04; C08L75/00; C08L75/04; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/269; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A MEGNETIC RECORDING ELEMENT COMPRISING A BASE AND A COATING UPON A SURFACE OF SAID BASE, SAID COATING COMPRISING MAGNETIC PARTICLES IN A BINDER, SAID BINDER CONSISTING ESSENTIALLY OF 5 TO 75 WEIGHT PERCENT OF A POLYMERIC MATRIX MATERIAL AND THE BALANCE OF A DIISOCYANATEBASED ELASTOMER, SAID MATRIX MATERIAL HAVING A MOLECULAR WEIGHT OF AT LEAST 2000 AND CONSISTING ESSENTAILLY OF AT LEAST ONE SOLID, SOLUBLE, THEMOPLASTIC COPOLYMER OF FROM 0.5 TO 50 WEIGHT PERCENT VINYL ALCOHOL AND THE BALANCE AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF VINYL ESTERS, VINYL ACETALS, VINYL HALIDES AND VINYLIDENE HALIDES, SAID DIISOCYANATE-BASED ELASTOMER CONSISTING ESSENTIALLY OF INTERCONNECTED UNITS HAVING THE FORMULA:
Claim 2
Dependent Claim
109 words
A MEGNETIC RECORDING ELEMENT COMPRISING A BASE AND A COATING UPON A SURFACE OF SAID BASE, SAID COATING COMPRISING MAGNETIC PARTICLES IN A BINDER, SAID BINDER CONSISTING ESSENTIALLY OF 5 TO 75 WEIGHT PERCENT OF A POLYMERIC MATRIX MATERIAL AND THE BALANCE OF A DIISOCYANATEBASED ELASTOMER, SAID MATRIX MATERIAL HAVING A MOLECULAR WEIGHT OF AT LEAST 2000 AND CONSISTING ESSENTAILLY OF AT LEAST ONE SOLID, SOLUBLE, THEMOPLASTIC COPOLYMER OF FROM 0.5 TO 50 WEIGHT PERCENT VINYL ALCOHOL AND THE BALANCE AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF VINYL ESTERS, VINYL ACETALS, VINYL HALIDES AND VINYLIDENE HALIDES, SAID DIISOCYANATE-BASED ELASTOMER CONSISTING ESSENTIALLY OF INTERCONNECTED UNITS HAVING THE FORMULA:
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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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |