US4486320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape guide for magnetic recording tape cassettes and magnetic recording tape cassettes containing same
Assignee: Fujifilm Holdings Corp
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Filing: 1982-06-17
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Granted: 1984-12-04
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Expires: 2002-06-17
Abstract
Abstract A tape guide member is disclosed which is prepared from a mixture of engineering plastics, carbon fibers, and an ester of a higher fatty acid, and a polyhydric alcohol. The members may be suitably used as tape guides of video tape cassettes, audio tape cassettes, and memory tape cassettes. Use of the present tape guide results in a lower degree of dropouts after repeated tape running.
Inventors
- 👤 Kiyoshi Sakurai
- 👤 Akira Ishi
- 👤 Yoshihiro Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:39
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B23/00; G11B23/02; G11B23/04; G11B23/041; G11B23/047
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
In a magnetic recording tape cassette provided with a tape guide, the improvement wherein the tape guide is composed of a composition comprising (1) an engineering plastic selected from the group consisting of polyphenylene sulfide resins, acrylonitrile-butadiene-styrene resins, polyamide resins, thermoplastic polyester resins, polysulfone, polycarbonate resins, polyphenylene oxide and polyoxymethylene, (2) an ester of a higher fatty acid with a polyhydric alcohol, said ester being contained in an amount of 0.3 to 5% by weight based on the weight of said engineering plastic, and (3) 5 to 50% by weight of carbon fibers based on the weight of said engineering plastic.
Claim 2
Dependent Claim
101 words
In a magnetic recording tape cassette provided with a tape guide, the improvement wherein the tape guide is composed of a composition comprising (1) an engineering plastic selected from the group consisting of polyphenylene sulfide resins, acrylonitrile-butadiene-styrene resins, polyamide resins, thermoplastic polyester resins, polysulfone, polycarbonate resins, polyphenylene oxide and polyoxymethylene, (2) an ester of a higher fatty acid with a polyhydric alcohol, said ester being contained in an amount of 0.3 to 5% by weight based on the weight of said engineering plastic, and (3) 5 to 50% by weight of carbon fibers based on the weight of said engineering plastic.
Claim 3
Dependent Claim
18 words
A magnetic recording cassette tape as claimed in claim 1, wherein the guide is a guide roller pin.
Claim 4
Dependent Claim
37 words
A magnetic recording cassette tape as claimed in claim 1, wherein said ester is composed of an aliphatic monocarboxylic acid having at least 6 carbon atoms and an organic polyhydric compound having at least two hydroxy groups.
Claim 5
Dependent Claim
28 words
A magnetic recording cassette tape as claimed in claim 3, wherein said ester is selected from the group consisting of ethylene glycol distearate, glycerol monostearate and glycerol tristearate.
Claim 6
Dependent Claim
77 words
In a magnetic recording tape cassette provided with a tape guide, the improvement wherein the tape guide is composed of a composition comprising (1) a polyphenylene sulfide resin, (2) an ester of a higher fatty acid with a polyhydric alcohol, said ester being contained in an amount of 0.3 to 5% by weight based on the weight of said resin, and (3) 5 to 50% by weight of carbon fibers based on the weight of said resin.
Claim 7
Dependent Claim
77 words
In a magnetic recording tape cassette provided with a tape guide, the improvement wherein the tape guide is composed of a composition comprising (1) a polyphenylene sulfide resin, (2) an ester of a higher fatty acid with a polyhydric alcohol, said ester being contained in an amount of 0.3 to 5% by weight based on the weight of said resin, and (3) 5 to 50% by weight of carbon fibers based on the weight of said resin.
Claim 8
Dependent Claim
22 words
A tape guide for a magnetic recording cassette tape as claimed in claim 5, wherein the guide is a guide roller pin.
Claim 9
Dependent Claim
41 words
A tape guide for a magnetic recording cassette tape as claimed in claim 5, wherein said ester is composed of an aliphatic monocarboxylic acid having at least 6 carbon atoms and an organic polyhydric compound having at least two hydroxy groups.
Claim 10
Dependent Claim
32 words
A tape guide for a magnetic recording cassette tape as claimed in claim 7, wherein said ester is selected from the group consisting of ethylene glycol distearate, glycerol monostearate and glycerol tristearate.
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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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |