US4434202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide member
Assignee: Sony Corp
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Filing: 1981-11-20
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Granted: 1984-02-28
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Expires: 2001-11-20
Abstract
Abstract The slide member is composed of a polymer composite material containing an unsaturated polyester resin, a thermoplastic resin and a granular inorganic filler. The slide member is of a double construction the surface of which is removed so as to expose part of the surface of the inorganic filler. The slide member thus constructed has particularly a favorable tape travelling property because it has a low friction coefficient, as well as the favorable properties inherent in the polymer composite material.
Inventors
- 👤 Satoru Uedaira
- 👤 Hidetoshi Shimizu
- 👤 Hidemasa Tamura
- 👤 Hiromichi Taguchi
- 👤 Hiroshi Yamanoi
- 👤 Yoshimi Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:36
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C33/201; B; B29; B29C; B29C70/00; B29C70/58; B29C70/64; C; C08; C08K; C08K3/00; C08K3/01; C08K3/013; C08K7/00; C08K7/16; C08K7/18; C08K7/20; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/08; C08L67/00; C08L67/06; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/25; Y10T428/252; Y10T428/256; Y10T428/257; Y10T428/258; Y10T428/259; Y10T428/31504; Y10T428/31786; Y10T428/31794
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
A slide member having at least one surface against which a traveling magnetic record member is arranged to contact, said slide member comprising a molded polymer composite material composed predominantly of a resinous composition and a granular inorganic filler material dispersed in said resinous composition, said resinous composition containing about 20 to 70% by volume of an unsaturated polyester resin, about 1 to 25% by volume of a thermoplastic resin, and 30 to 70% by volume of a liquid monomer being capable of polymerizing with said unsaturated polyester resin, said granular inorganic filler material having a particle size ranging from 1 to 100 microns and being present in said polymer composite material in an amount of from 40 to 65% by volume for 100% by volume of said resinous composition, said slide member having a surface layer thereof removed so as to expose part of the surface of said granular inorganic filler material.
Claim 2
Dependent Claim
153 words
A slide member having at least one surface against which a traveling magnetic record member is arranged to contact, said slide member comprising a molded polymer composite material composed predominantly of a resinous composition and a granular inorganic filler material dispersed in said resinous composition, said resinous composition containing about 20 to 70% by volume of an unsaturated polyester resin, about 1 to 25% by volume of a thermoplastic resin, and 30 to 70% by volume of a liquid monomer being capable of polymerizing with said unsaturated polyester resin, said granular inorganic filler material having a particle size ranging from 1 to 100 microns and being present in said polymer composite material in an amount of from 40 to 65% by volume for 100% by volume of said resinous composition, said slide member having a surface layer thereof removed so as to expose part of the surface of said granular inorganic filler material.
Claim 3
Dependent Claim
17 words
The slide member according to claim 1 wherein the unsaturated polyester resin is an unsaturated linear polyester.
Claim 4
Dependent Claim
16 words
The slide member according to claim 2 wherein the unsaturated polyester is of a three-component system.
Claim 5
Dependent Claim
29 words
The slide member according to claim 1 wherein the thermoplastic resin is a derivative from a compound having a polymerizable reactive group represented by the moiety: CH 2 ═C═.
Claim 6
Dependent Claim
21 words
The slide member according to claim 4 wherein the thermoplastic resin has a molecular weight ranging from approximately 10,000 to 10,000,000.
Claim 7
Dependent Claim
21 words
The slide member according to claim 1 wherein the polymer composite material further contains a polymerization initiator and a releasing agent.
Claim 8
Dependent Claim
28 words
The slide member according to claim 1 wherein an element of the slide member on which a magnetic recording medium runs is composed of two portions formed integrally.
References Cited (Backward Citations)
US4364985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |