Patent US4033768A successfully refreshed from Google Patents.
US4033768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of an electrostatographic photosensitive device
Assignee: Xerox Corp
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Filing: 1976-04-14
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Granted: 1977-07-05
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Expires: 1996-04-14
Abstract
Abstract Disclosed is a method for the preparation of a seamless belt useful as the photosensitive element in an electrostatographic copying device. The method comprises: A. applying a film or soluble material over a mandrel; B. applying a photosensitive layer over the soluble film and heat treating the photosensitive layer; C. applying a layer of conductive material over the photosensitive layer; D. applying a seamless, heat shrinkable film of a thermoplastic resin over the layer of conductive material and heat shrinking the film to form a layered, endless belt; E. removing the layered belt from the mandrel; F. contacting the belt with a solvent for the soluble film to thereby dissolve the film; and G. turning the belt inside out to provide a belt having layers from the inside out of the seamless polymeric film, the conductive material and the photosensitive layer.
Inventors
- 👤 Francis J. Wieloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:49
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10; G03G5/02; G03G5/04; G03G5/05; G03G5/0525; G03G5/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
131 words
A method for the preparation of a seamless belt useful as the photosensitive element in an electrostatographic copying device which comprises: (a) applying a film of soluble material over a mandrel; (b) applying a photoconductive layer over the soluble film and heat treating the photoconductive layer; (c) applying a layer of conductive material over the photosensitive layer; (d) applying a seamless shrink film of a thermoplastic resin over the layer of conductive material to form a layered, endless belt; (e) removing the layered belt from the mandrel; (f) contacting the belt with a solvent for the soluble film to thereby dissolve the film; and (g) turning the belt inside out to provide a belt having layers from the bottom up of the polymeric film, the conductive material and the photoconductive layer.
Claim 2
Independent Claim
131 words
A method for the preparation of a seamless belt useful as the photosensitive element in an electrostatographic copying device which comprises: (a) applying a film of soluble material over a mandrel; (b) applying a photoconductive layer over the soluble film and heat treating the photoconductive layer; (c) applying a layer of conductive material over the photosensitive layer; (d) applying a seamless shrink film of a thermoplastic resin over the layer of conductive material to form a layered, endless belt; (e) removing the layered belt from the mandrel; (f) contacting the belt with a solvent for the soluble film to thereby dissolve the film; and (g) turning the belt inside out to provide a belt having layers from the bottom up of the polymeric film, the conductive material and the photoconductive layer.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein a layer of adhesive is applied to the exposed surface of the conductive material to bind the polymeric film thereto.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein the mandrel is collapsible.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein the soluble material is polyvinyl alcohol, ethyl hydroxyethyl cellulose, methylcellulose, starch or polyethylene oxide.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the photoconductive layer comprises a charge generator material dispersed in an organic charge transport material.
Claim 7
Dependent Claim
26 words
The method of claim 5 wherein the charge generator material is the X form of metal free phthalocyanine and the charge transport material is poly (N-vinylcarbazole).
Claim 8
Dependent Claim
26 words
The method of claim 1 wherein the photoconductive layer comprises a layer of a charge generating material and a separate layer of a charge transport material.
Claim 9
Dependent Claim
24 words
The method of claim 1 wherein the photoconductive layer comprises a layer of photoconductive pigment and a separate layer of an electrically insulating resin.
Claim 10
Dependent Claim
19 words
The method of claim 1 wherein the conductive material is brass, steel or a conductively coated dielectric or insulator.
Claim 11
Dependent Claim
31 words
The method of claim 1 wherein a 30 A to 1.0 micron thick blocking layer is applied to the exposed surface of the photoconductive layer before the conductive layer is applied.
Claim 12
Dependent Claim
29 words
The method of claim 1 wherein the polymeric shrink film is a polyester, a polyethylene, a polypropylene, a polystyrene, a polyvinyl chloride, a polyvinylidene chloride copolymer or rubber hydrochloride.
Claim 13
Dependent Claim
12 words
The method of claim 1 wherein the shrink film is oriented polypropylene.
References Cited (Backward Citations)
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US3819370A
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US3697265A
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US3787207A
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US3813271A
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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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |