Patent US3844919A successfully refreshed from Google Patents.
US3844919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing photosensitive surfaces
Assignee: Ricoh Co Ltd
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Filing: 1972-11-06
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Granted: 1974-10-29
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Expires: 1992-11-06
Abstract
Abstract Photosensitive surfaces are formed on an electroconductive substrate by electrodeposition of zinc oxide from a system (suspension) containing photoconductive zinc oxide dispersed therein with an electrically insulating resin in a solvent for said resin.
Inventors
- 👤 S Shiota
- 👤 T Sohtome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:17
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0525; C; C25; C25D; C25D13/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
A METHOD OF PRODUCING A ZINC OXIDE-CONTAINING PHOTOSENSITIVE LAYER UPON AN ELECTROCONDUCTIVE SUBSTRATE WHICH COMPRISES FORMING A DISPERSE SYSTEM COMPRISING FINELY DIVIDED PHOTOCONDUCTIVE ZINC OXIDE AND FOR EACH 100 G. OF ZINC OXIDE FROM ABOUT 15-30 G. OF AN ELECTRICALLY INSULATING RESIN IN FROM ABOUT 400-1,000 CC. OF LIQUID MEDIUM AND ELECTRODEPOSITING SAID ZINC OXIDE ASSOCIATED WITH SAID RESIN ON THE SAID SUBSTRATE AT A CURRENT DENSITY OF FROM ABOUT 0.5-2 MAMP./DM2 AT A TEMPERATURE OF FROM ABOUT 10*-25*C. TO PRODUCE A PHOTOSENSITIVE LAYER HAVING A THICKNESS OF UP TO ABOUT 400 MICRONS.
Claim 2
Independent Claim
93 words
A METHOD OF PRODUCING A ZINC OXIDE-CONTAINING PHOTOSENSITIVE LAYER UPON AN ELECTROCONDUCTIVE SUBSTRATE WHICH COMPRISES FORMING A DISPERSE SYSTEM COMPRISING FINELY DIVIDED PHOTOCONDUCTIVE ZINC OXIDE AND FOR EACH 100 G. OF ZINC OXIDE FROM ABOUT 15-30 G. OF AN ELECTRICALLY INSULATING RESIN IN FROM ABOUT 400-1,000 CC. OF LIQUID MEDIUM AND ELECTRODEPOSITING SAID ZINC OXIDE ASSOCIATED WITH SAID RESIN ON THE SAID SUBSTRATE AT A CURRENT DENSITY OF FROM ABOUT 0.5-2 MAMP./DM2 AT A TEMPERATURE OF FROM ABOUT 10*-25*C. TO PRODUCE A PHOTOSENSITIVE LAYER HAVING A THICKNESS OF UP TO ABOUT 400 MICRONS.
Claim 3
Dependent Claim
26 words
A method in accordance with claim 1 wherein said zinc oxide-containing photosensitive layer is deposited on said substrate to a thickness not greater than 40 microns.
Claim 4
Dependent Claim
42 words
A method in accordance with claim 1 wherein said disperse system comprises said resin, said liquid medium, and said photoconductive zinc oxide in the proportions 15-30 g of resin and 400-1,000 cc of liquid medium to 100 g of photoconductive zinc oxide.
Claim 5
Dependent Claim
29 words
A method according to claim 1 wherein said resin is selected from the group consisting of non-polar resins, acrylic resins, alkyd resins, melamine resins and vinyl acetate-crotonic acid resins.
Claim 6
Dependent Claim
30 words
A method in accordance with claim 1 wherein said lIquid medium is selected from the group consisting of toluene, xylene, tetrachloroethylene, ethylene dichloride, heptane, octane, trichloroethane, methylene chloride and water.
Claim 7
Dependent Claim
43 words
An electrodeposited zinc oxide containing photosensitive layer comprising photoconductive zinc oxide particles together with an electrically insulating resin, the electrodeposited layer having a thickness not greater than about 40 microns, the ratio of zinc oxide to resin being from about 100:15 to 100:30.
Claim 8
Dependent Claim
43 words
An electrodeposited zinc oxide containing photosensitive layer comprising photoconductive zinc oxide particles together with an electrically insulating resin, the electrodeposited layer having a thickness not greater than about 40 microns, the ratio of zinc oxide to resin being from about 100:15 to 100:30.
Claim 9
Dependent Claim
74 words
A bath useful for the electrodeposition of a photosensitive zinc oxide-containing coating upon an electrically conductive substrate in contact with said bath, said bath containing finely divided photoconductive zinc oxide together with an electrically insulating resin dispersed in a liquid medium, the ratio of zinc oxide to resin being from about 100:15 to 100:30, the proportion of liquid medium to zinc oxide being 400-1,000 cc. of liquid medium to 100 grams of zinc oxide.
Claim 10
Dependent Claim
74 words
A bath useful for the electrodeposition of a photosensitive zinc oxide-containing coating upon an electrically conductive substrate in contact with said bath, said bath containing finely divided photoconductive zinc oxide together with an electrically insulating resin dispersed in a liquid medium, the ratio of zinc oxide to resin being from about 100:15 to 100:30, the proportion of liquid medium to zinc oxide being 400-1,000 cc. of liquid medium to 100 grams of zinc oxide.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |