US4375201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing apparatus
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1981-05-11
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Granted: 1983-03-01
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Expires: 2001-05-11
Abstract
Abstract An apparatus for fixing a toner-image by transporting a toner image bearing material as it is held between a heated fixing roll and a compression roll. The apparatus uses a porous tube of tetrafluoroethylene resin with both ends sealed which is placed in contact with the fixing roll in an axial direction and a release agent is applied onto the surface of the fixing roll through the porous tube.
Inventors
- 👤 Chiaki Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:21
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2017; G03G15/2025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
An apparatus for fixing a toner image by transporting a toner image bearing material as it passes between a heated rotating fixing roll and a compression roll comprising: a stationary porous tube of tetrafluoroethylene resin having sealed ends and a release agent therein, said tube being disposed in contact with said fixing roll and being disposed along an axial direction of said fixing roll, said release agent being applied onto a surface of said fixing roll through open pores in said porous tube confronting said fixing roll, said pores in said tube not confronting said fixing roll being sealed.
Claim 2
Independent Claim
99 words
An apparatus for fixing a toner image by transporting a toner image bearing material as it passes between a heated rotating fixing roll and a compression roll comprising: a stationary porous tube of tetrafluoroethylene resin having sealed ends and a release agent therein, said tube being disposed in contact with said fixing roll and being disposed along an axial direction of said fixing roll, said release agent being applied onto a surface of said fixing roll through open pores in said porous tube confronting said fixing roll, said pores in said tube not confronting said fixing roll being sealed.
Claim 3
Dependent Claim
19 words
The apparatus according to claim 1 wherein said porous tube of tetrafluoroethylene resin is fixed to a support member.
Claim 4
Dependent Claim
45 words
The apparatus according to claim 1 wherein said porous tube of tetrafluoroethylene resin has a pore size of 0.1 to 10 μm, a porosity of 50 to 85%, an outside diameter of 5 to 50 mm, and a wall thickness of 0.1 to 5 mm.
Claim 5
Dependent Claim
26 words
The apparatus according to claim 1 wherein said sealed pores are formed by coating said area where the pores are to be sealed with heat-resistant rubber.
Claim 6
Dependent Claim
60 words
The apparatus according to claim 1 further comprising a rubber plug 1 to 20 mm thick attached to part of an area of said porous tube of tetrafluoroethylene resin other than an area through which said release agent is to pass, said part providing an inlet for said release agent, said release agent being injected through said part and plug.
Claim 7
Dependent Claim
19 words
The apparatus according to claim 1 wherein said ends of said porous tube of tetrafluoroethylene resin are heat sealed.
Claim 8
Dependent Claim
44 words
The apparatus according to claim 1 wherein said ends of said porous tube of tetrafluoroethylene resin are sealed with a rubber plug 1 to 20 mm thick, said ends providing an inlet for said release agent, said release agent being injected through said plug.
References Cited (Backward Citations)
US4170957A
Cited
US4309957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |