US3983302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Sony Music Holdings Inc
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Filing: 1973-08-20
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Granted: 1976-09-28
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Expires: 1993-08-20
Abstract
Abstract A magnetic recording medium comprising a base having a coating thereon containing magnetic particles, and wherein the binder contains a vinyl terpolymer and a diisocyanate.
Inventors
- 👤 Richard S. Zucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:48
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; Y10T428/31565; Y10T428/31573; Y10T428/31576; Y10T428/3158; Y10T428/31609
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
72 words
A magnetic recording medium comprising a backing material and an adherent coating thereon, said coating comprising magnetic particles dispersed in a resinous binder, said binder containing a polyurethane derived from a terpolymer and a diisocyanate, said terpolymer containing vinyl chloride, vinyl acetate, and a third monomer selected from the group consisting of glycol monoacrylate and glycol monomethacrylate, said terpolymer containing 51 to 94% by weight of vinyl chloride, 16 to 2% by
Claim 2
Dependent Claim
72 words
A magnetic recording medium comprising a backing material and an adherent coating thereon, said coating comprising magnetic particles dispersed in a resinous binder, said binder containing a polyurethane derived from a terpolymer and a diisocyanate, said terpolymer containing vinyl chloride, vinyl acetate, and a third monomer selected from the group consisting of glycol monoacrylate and glycol monomethacrylate, said terpolymer containing 51 to 94% by weight of vinyl chloride, 16 to 2% by
Claim 3
Dependent Claim
21 words
A magnetic recording medium according to claim 1 wherein said terpolymer contains the following percentages: vinyl chloride 87%; vinyl acetate 5%;
Claim 4
Dependent Claim
21 words
A magnetic recording medium according to claim 1 wherein the third monomer of the terpolymer contains an ethylenic or substituted ethylenic
Claim 5
Dependent Claim
104 words
A magnetic recording medium comprising a backing material and an adherent coating thereon, said coating comprising magnetic particles dispersed in a resinous binder, said binder containing a polyurethane derived from a terpolymer and a diisocyanate-terminated prepolymer, said terpolymer containing vinyl chloride, vinyl acetate, and a third monomer selected from the group consisting of glycol monoacryalate and glycol monomethacryalate and said prepolymer containing a diisocyanate and a constituent selected from the group consisting of a polyester and a polyether, said terpolymer containing 51 to 94% by weight of vinyl chloride, 16 to 2% by weight of vinyl acetate, and 33 to 4% by weight of
Claim 6
Dependent Claim
104 words
A magnetic recording medium comprising a backing material and an adherent coating thereon, said coating comprising magnetic particles dispersed in a resinous binder, said binder containing a polyurethane derived from a terpolymer and a diisocyanate-terminated prepolymer, said terpolymer containing vinyl chloride, vinyl acetate, and a third monomer selected from the group consisting of glycol monoacryalate and glycol monomethacryalate and said prepolymer containing a diisocyanate and a constituent selected from the group consisting of a polyester and a polyether, said terpolymer containing 51 to 94% by weight of vinyl chloride, 16 to 2% by weight of vinyl acetate, and 33 to 4% by weight of
Claim 7
Dependent Claim
10 words
A magnetic recording medium according to claim 4 wherein the
Claim 8
Dependent Claim
10 words
A magnetic recording medium according to claim 4 wherein said
Claim 9
Dependent Claim
11 words
A magnetic recording medium according to claim 6 wherein said polyester
Claim 10
Dependent Claim
10 words
A magnetic recording medium according to claim 4 wherein said
Claim 11
Dependent Claim
11 words
A magnetic recording medium according to claim 8 wherein said polyether
Claim 12
Dependent Claim
10 words
A magnetic recording medium according to claim 9 wherein said
Claim 13
Dependent Claim
14 words
A magnetic recording medium according to claim 7 wherein said diisocyanate is methylene bis-(4-phenylisocyanate).
References Cited (Backward Citations)
GB1097613A
Cited
US3470021A
Cited
US3523086A
Cited
US3525694A
Cited
US3597273A
Cited
US3650828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |