Patent US3144352A successfully refreshed from Google Patents.
US3144352A
Expired / Lapsed
US
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Magnetic tape having a binder mixture of polyurethane resin and a copolymer of vinylidene chloride and acrylonitrile
Assignee: Ampex Corp
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Filing: 1962-10-15
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Granted: 1964-08-11
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Expires: 1982-10-15
Abstract
No abstract record available.
Inventors
- 👤 James P Talley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; G11B5/7022; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G18/341; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/08; C08L33/00; C08L33/18; C08L33/20; C08L75/00; C08L75/04; C08L75/06; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/249921; Y10T428/31504; Y10T428/31551; Y10T428/31627
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A LONG WEAR MAGENTIC RECORDING MEDIUM COMPRISNG A PLASTIC BASE AND AN ADHERENT COATING, INCLUDING A MAGNETIC PIGMENT DISPERSED IN A RESIN MIXTURE, SAID RESIN MIXTURE COMPRISING A POLYURETHANE RESIN WHICH IS MADE BY REACTING A MIXTURE CONSISTING OF P,P''-DIPHENYLMETHANE DIISOCYANATE, ADIPIC ACID AND BUTANEDIOL-1,4 WHICH RESIN IS FREE OF REACTIVE ISOCYANATE GROUPS, AND A COPOLYMER OF VINYLIDENE CHLORIDE AND ACRYLONITRILE, AT LEAST 5% OF THE RESIN MIXTURE CONSISTING OF SAID POLYURETHANE RESIN, SAID COPOLYMER HAVING ABOUT 1, SPECIFIC GRAVITY, FROM 7,000 TO 7,500 LBS./SQ. INCH TENSILE STRENGTH, AND FROM 0-10% ELONGATION.
Claim 2
Dependent Claim
92 words
A LONG WEAR MAGENTIC RECORDING MEDIUM COMPRISNG A PLASTIC BASE AND AN ADHERENT COATING, INCLUDING A MAGNETIC PIGMENT DISPERSED IN A RESIN MIXTURE, SAID RESIN MIXTURE COMPRISING A POLYURETHANE RESIN WHICH IS MADE BY REACTING A MIXTURE CONSISTING OF P,P''-DIPHENYLMETHANE DIISOCYANATE, ADIPIC ACID AND BUTANEDIOL-1,4 WHICH RESIN IS FREE OF REACTIVE ISOCYANATE GROUPS, AND A COPOLYMER OF VINYLIDENE CHLORIDE AND ACRYLONITRILE, AT LEAST 5% OF THE RESIN MIXTURE CONSISTING OF SAID POLYURETHANE RESIN, SAID COPOLYMER HAVING ABOUT 1, SPECIFIC GRAVITY, FROM 7,000 TO 7,500 LBS./SQ. INCH TENSILE STRENGTH, AND FROM 0-10% ELONGATION.
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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) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |