Patent US4874927A successfully refreshed from Google Patents.
US4874927A
Expired / Lapsed
US
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Heating roll for fixing toner
Assignee: Proterial Ltd
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Filing: 1988-06-07
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Granted: 1989-10-17
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Expires: 2008-06-07
Abstract
Abstract The resistive layer of an electrically heated toner fixing roll includes a Fe-Cr-Al metal alloy phase and a ceramic substrate phase thermally sprayed onto the surface of a thermally and electrically insulated metal roll. The ceramic substrate can be Al 2 O 3 and the alloy can be 64-89 wt % Fe; 10-30 wt % Cr; and 2-10 wt % Al. Al 2 O 3 can be the insulating layer, and the metal roll can be iron, or an iron-based alloy.
Inventors
- 👤 Ryoichi Shibata
- 👤 Toshiyuki Kasakoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057; H; H05; H05B; H05B3/00; H05B3/0095
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
In a heating roll for fixing toner of the type in which a heating resistor layer is provided on the circumference of a cylindrical substrate so that when a voltage is applied to the heating resistor layer through an electrode, the heating resistor layer generates heat, wherein the improvement comprises the heating resistor layer being constituted by an Fe-Cr-Al alloy phase dispsersed into a ceramic substrate phase, said Fe-Cr-Al alloy phase being electrically continuous in the axial direction of said heating roll said Fe-Cr-Al alloy comprising 64-89 wt % of Fe, 10-30 wt. % of Cr, and 2-10 wt. % of al.
Claim 2
Dependent Claim
102 words
In a heating roll for fixing toner of the type in which a heating resistor layer is provided on the circumference of a cylindrical substrate so that when a voltage is applied to the heating resistor layer through an electrode, the heating resistor layer generates heat, wherein the improvement comprises the heating resistor layer being constituted by an Fe-Cr-Al alloy phase dispsersed into a ceramic substrate phase, said Fe-Cr-Al alloy phase being electrically continuous in the axial direction of said heating roll said Fe-Cr-Al alloy comprising 64-89 wt % of Fe, 10-30 wt. % of Cr, and 2-10 wt. % of al.
Claim 3
Dependent Claim
30 words
The improved heating roll for fixing toner according to claim 1, characterized in that said heating resistor layer comprises 70-90% of ceramic material and 10-30 wt. % of Fe-Cr-Al alloy.
Claim 4
Dependent Claim
28 words
The improved heating roll for fixing toner according to claim 1, characterized in that the ceramic material in said heating resistor layer is Al 2 O 3 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |