US4179601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing apparatus for electrophotographic copying machine
Assignee: Konica Minolta Inc
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Filing: 1978-06-01
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Granted: 1979-12-18
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Expires: 1998-06-01
Abstract
Abstract A roller type fixing apparatus for an electrophotographic copying machine comprising a fixing roller, a pressing roller disposed to confront and have contact with said fixing roller and a mechanism for rotating said fixing roller and press roller. At least one of said fixing roller and press roller has a peripheral surface layer portion composed of a resinous material and a low electric resistance powder incorporated therein and said peripheral surface layer portion is electrically grounded.
Inventors
- 👤 Noriyoshi Tarumi
- 👤 Kenji Ueno
- 👤 Hirofumi Sakaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
29 words
A fixing apparatus for an electrophotographic copying machine which apparatus comprises a rotatable heated fixing roller having a resinous surface layer comprising a resinous fluorine material and carbon black.
Claim 2
Dependent Claim
29 words
A fixing apparatus for an electrophotographic copying machine which apparatus comprises a rotatable heated fixing roller having a resinous surface layer comprising a resinous fluorine material and carbon black.
Claim 3
Dependent Claim
31 words
A fixing apparatus as set forth in claim 1 wherein the fixing apparatus further comprises a press roller being contacted with the fixing roller with pressure at least during copying operation.
Claim 4
Dependent Claim
18 words
A fixing apparatus as set forth in claim 1 wherein the resinous fluorine material is a tetrafluoroethylene polymer.
Claim 5
Dependent Claim
21 words
A fixing apparatus as set forth in claim 1 wherein the resinous fluorine material is a copolymer of tetrafluoroethylene and hexafluoropropylene.
Claim 6
Dependent Claim
21 words
A fixing apparatus as set forth in claim 1 wherein the resinous fluorine material is a copolymer of tetrafluoroethylene and perfluoro-alkoxiethylene.
Claim 7
Dependent Claim
18 words
A fixing apparatus as set forth in claim 1 wherein the resinous surface layer further comprises titanium dioxide.
Claim 8
Dependent Claim
63 words
An electrophotographic copying machine having a fixing apparatus which comprises a pair of rollers for fixing toner images onto a recording sheet, one of which rollers is a heated fixing roller having a resinous surface layer comprising a resinous fluorine material and carbon black while the other being contacted to the fixing roller with pressure, the toner comprising polypropylen of low molecular weight.
Claim 9
Dependent Claim
63 words
An electrophotographic copying machine having a fixing apparatus which comprises a pair of rollers for fixing toner images onto a recording sheet, one of which rollers is a heated fixing roller having a resinous surface layer comprising a resinous fluorine material and carbon black while the other being contacted to the fixing roller with pressure, the toner comprising polypropylen of low molecular weight.
References Cited (Backward Citations)
US3235772A
Cited
US3809854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |