Patent US4887340A successfully refreshed from Google Patents.
US4887340A
Expired / Lapsed
US
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Elastic fixing roller
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1988-10-19
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Granted: 1989-12-19
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Expires: 2008-10-19
Abstract
Abstract A fixing roller for use in the fixing stage of a fixing apparatus such as a copying machine provided with multiple rubber and/or fabric layers of certain thicknesses and hardnesses surrounding a core member to improve the copying characteristics of the roller.
Inventors
- 👤 Chiaki Kato
- 👤 Masaya Nishi
- 👤 Toshiyuki Hatta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:43
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29D; B29D99/00; B29D99/0032; B29D99/0035; F; F16; F16C; F16C13/00; G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057; B29L; B29L2031/00; B29L2031/32; B29L2031/324
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
An elastic fixing roller for use in a fixing stage of a fixing apparatus such as a copying machine comprising: a roller base member; and a layer of porous fluorocarbon resin provided on the outer surface of said roller base member, said porous material havig porous portions impregnated with heat-resistant liquid rubber that hardens after impregnation, said porous material being formed by extending and baking said fluorocarbon resin filled with an inorganic filler having a particle size no larger than 5 μm to enlarge the pore size of said porous portions, said liquid rubber containing an inorganic filler and a releasing agent to provide heat-resistance, heat conductivity, electrical conductivity, and releasing properties.
Claim 2
Dependent Claim
112 words
An elastic fixing roller for use in a fixing stage of a fixing apparatus such as a copying machine comprising: a roller base member; and a layer of porous fluorocarbon resin provided on the outer surface of said roller base member, said porous material havig porous portions impregnated with heat-resistant liquid rubber that hardens after impregnation, said porous material being formed by extending and baking said fluorocarbon resin filled with an inorganic filler having a particle size no larger than 5 μm to enlarge the pore size of said porous portions, said liquid rubber containing an inorganic filler and a releasing agent to provide heat-resistance, heat conductivity, electrical conductivity, and releasing properties.
Claim 3
Dependent Claim
32 words
An elastic fixing roller as set forth in claim 1, wherein said porous fluorocarbon resin is an ethylene tetrafluoride resin having a porosity of 70-95% and a pore size of 1-50 μm.
Claim 4
Dependent Claim
34 words
An elastic fixing roller as set forth in claim 1, wherein said fluorocarbon resin containing 2-30 portions of filler, and said filler and releasing agent are contained in said liquid rubber by 0.1-20 portions.
Claim 5
Dependent Claim
21 words
An elastic fixing roller as set forth in claim 1, wherein said inorganic filler is a conductive material such as carbon.
Claim 6
Dependent Claim
18 words
An elastic fixing roller as set forth in claim 1, wherein said inorganic filler is iron oxide red.
Claim 7
Dependent Claim
16 words
An elastic fixing roller as set forth in claim 1, wherein said inorganic filler is silica.
Claim 8
Dependent Claim
35 words
An elastic fixing roller as set forth in claim 1, wherein said releasing agent contained in said heat-resistant liquid rubber is silicone oil having a viscosity within a range of 10 c.s. to 10,000 c.s.
References Cited (Backward Citations)
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US4254732A
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US4320714A
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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) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |