US4806985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stripper fingers
Assignee: Xerox Corp
•
Filing: 1987-04-02
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Granted: 1989-02-21
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Expires: 2007-04-02
Abstract
Abstract A sheet stripping device for electrostatographic systems includes a frame, a member having movable surface for conveying a receiving sheet, and a sheet stripping element for separating the receiving sheet from the movable surface, the sheet stripping element including a stripping element having a leading edge adapted to contact the movable surface and strip the sheet from the movable surface, the leading edge coated with a material including an electrically conductive material comprising a film forming polymer and an electrically conductive additive. The leading edge may include a thermally resistant polymer of cross-linked siloxane-silica hybrid material, a polyimide or a poly(amide-imide). The sheet stripping means may be prepared by coating the leading edges of preformed stripping elements.
Inventors
- 👤 Geoffrey M. T. Foley
- 👤 Richard L. Schank
- 👤 Kenneth A. Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:34
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6532; Y; Y10; Y10S; Y10S271/00; Y10S271/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
176 words
In an electrostatographic imaging apparatus comprising a frame, a member having a movable surface adapted to receive a receiving sheet, and a sheet stripping means for separating said receiving sheet from said movable surface, said sheet stripping means comprising a support element and a stripping element, said stripping element having a leading edge adapted to contact said movable surface and strip said sheet from said movable surface, said leading edge comprising a metal substrate, a film forming primer coating on said substrate, and an electrically conductive coating on said film forming primer coating, said electrically conductive coating having a volume resistivity of less than about 10 13 ohm centimeters, a thickness of at least about 0.5 micrometer, and comprising a film forming polymer and an electrically conductive additive, said film forming polymer selected from the group consisting of a cross-linked siloxanol-colloidal silica hybrid material, a polyimide and poly(amide-imide), and said electrically conductive additive having a volume resistivity of less than about 10 10 ohm centimeters and an average particle size of less than about 0.1 micrometer.
Claim 2
Dependent Claim
176 words
In an electrostatographic imaging apparatus comprising a frame, a member having a movable surface adapted to receive a receiving sheet, and a sheet stripping means for separating said receiving sheet from said movable surface, said sheet stripping means comprising a support element and a stripping element, said stripping element having a leading edge adapted to contact said movable surface and strip said sheet from said movable surface, said leading edge comprising a metal substrate, a film forming primer coating on said substrate, and an electrically conductive coating on said film forming primer coating, said electrically conductive coating having a volume resistivity of less than about 10 13 ohm centimeters, a thickness of at least about 0.5 micrometer, and comprising a film forming polymer and an electrically conductive additive, said film forming polymer selected from the group consisting of a cross-linked siloxanol-colloidal silica hybrid material, a polyimide and poly(amide-imide), and said electrically conductive additive having a volume resistivity of less than about 10 10 ohm centimeters and an average particle size of less than about 0.1 micrometer.
Claim 3
Dependent Claim
19 words
In an electrostatographic imaging apparatus according to claim 1, wherein said film forming primer coating is submicron in thickness.
Claim 4
Dependent Claim
20 words
In an electrostatographic imaging apparatus according to claim 1, wherein said film forming primer coating contains an electrically conductive additive.
Claim 5
Dependent Claim
25 words
In an electrostatographic imaging apparatus according to claim 1, wherein said cross-linked siloxanol-colloidal silica hybrid material has a decomposition temperature greater than about 180° C.
Claim 6
Dependent Claim
43 words
In an electrostatographic imaging apparatus according to claim 1, wherein said leading edge comprises a film forming primer coating between said substrate and said electrically conductive coating on said film forming primer coating, said film forming primer coating comprising an organosiloxane coupling agent.
Claim 7
Dependent Claim
26 words
In an electrostatographic imaging apparatus according to claim 1, wherein said film forming polymer is a polyimide having a decomposition temperature greater than about 180° C.
Claim 8
Dependent Claim
26 words
In an electrostatographic imaging apparatus according to claim 1, wherein said film forming polymer is a poly(amide-imide) having a decomposition temperature greater than about 180° C.
Claim 9
Dependent Claim
18 words
In an electrostatographic imaging apparatus according to claim 1, wherein said said movable surface is a photoreceptor surface.
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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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |