US3911196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape binder system
Assignee: Ampex Media Corp
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Filing: 1974-09-30
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Granted: 1975-10-07
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Expires: 1994-09-30
Abstract
Abstract A binder for magnetic particles for a magnetic recording medium employs a combination of a polyurethane resin, a phenoxy resin and a vinylidine chloride-acrylonitrile resin. The binder system is particularly useful for a magnetic tape employed on a helical scan, video recorder.
Inventors
- 👤 Rodolfo Bautista Navidad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:38
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; G11B5/7022; C; C08; C08L; C08L75/00; C08L75/04; C09; C09D; C09D175/00; C09D175/04; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/31504; Y10T428/31551; Y10T428/31565; Y10T428/31573; Y10T428/3158; Y10T428/31583; Y10T428/31609
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
IN A MAGNETIC MEDIUM WHEREIN THE MEDIUM COMPRISES A NOMAGETIC SUBSTRATE WITH A MAGNETIC COATING THEREON, SAID COATING COMPRISING A DISPERSION OF MAGNETIC PARTICLES HELD IN A RESINOUS ORGANIC BINDER, THE IMPROVEMENT COMPRISING A BINDER CONTAINING FROM 35 TO 75% OF A POLYURETHANE RESIN, FROM 10 TO 20% OF A PHENOXY RESIN AND FROM 15 TO 45% OF A VINYLIDINE CHLORIDE-ACRYLONITRILE RESIN, ALL PERCENTAGES BEING BY WEIGHT.
Claim 2
Dependent Claim
67 words
IN A MAGNETIC MEDIUM WHEREIN THE MEDIUM COMPRISES A NOMAGETIC SUBSTRATE WITH A MAGNETIC COATING THEREON, SAID COATING COMPRISING A DISPERSION OF MAGNETIC PARTICLES HELD IN A RESINOUS ORGANIC BINDER, THE IMPROVEMENT COMPRISING A BINDER CONTAINING FROM 35 TO 75% OF A POLYURETHANE RESIN, FROM 10 TO 20% OF A PHENOXY RESIN AND FROM 15 TO 45% OF A VINYLIDINE CHLORIDE-ACRYLONITRILE RESIN, ALL PERCENTAGES BEING BY WEIGHT.
Claim 3
Dependent Claim
15 words
The medium of claim 1 whereiN the binder contains about 50% of the polyurethane resin.
Claim 4
Dependent Claim
21 words
The medium of claim 1 wherein the polyurethane resin contains about equal parts of a polyester-urethane resin and a polyether-urethane resin.
Claim 5
Dependent Claim
30 words
The medium of claim 1 wherein the binder additionally contains a polyisocyanate in an amount of from 1 to 3 parts for each 10 parts of the other binder components.
References Cited (Backward Citations)
US3616145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |