Patent US4175958A successfully refreshed from Google Patents.
US4175958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry planographic printing method and plate made by electrophotographic method using conductive toner
Assignee: Toppan Inc
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Filing: 1977-12-20
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Granted: 1979-11-27
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Expires: 1997-12-20
Abstract
Abstract This invention provides a dry planographic printing plate prepared by forming on an electrically conductive support a photoconductive layer composed of a binder and photoconductive powder dispersed in the binder, charging and then image-exposing a resultant photosensitive plate, and finally developing by means of a conductive toner and fixing the conductive toner. This invention also provides a dry planographic printing method including reversal-developing said printing plate by using a toner, transferring the toner to a sheet of transfer material, and then fixing the toner, as well as an apparatus used in said printing method.
Inventors
- 👤 Tsutomu Naganuma
- 👤 Hisao Hoshi
- 👤 Hiroji Kumagai
- 👤 Kaneki Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:06
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/228; G03G13/00; G03G13/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
A dry planographic printing method comprising charging the surface of a dry planographic printing plate, reversal-developing said printing plate by means of a toner, transferring said toner to a transfer material, and fixing said toner; said dry planographic printing plate being prepared by charging and image-exposing a photosensitive plate including an electrically conductive support and a photoconductive layer formed on said support, said photoconductive layer comprising a resin binder and a photoconductive powder dispersed in said binder; and then developing said photosensitive plate by means of a conductive toner and fixing said conductive toner.
Claim 2
Dependent Claim
94 words
A dry planographic printing method comprising charging the surface of a dry planographic printing plate, reversal-developing said printing plate by means of a toner, transferring said toner to a transfer material, and fixing said toner; said dry planographic printing plate being prepared by charging and image-exposing a photosensitive plate including an electrically conductive support and a photoconductive layer formed on said support, said photoconductive layer comprising a resin binder and a photoconductive powder dispersed in said binder; and then developing said photosensitive plate by means of a conductive toner and fixing said conductive toner.
Claim 3
Dependent Claim
27 words
A dry planographic printing method according to claim 1, wherein said photoconductive layer consists essentially of said resin binder and said photoconductive powder disbursed in said binder.
Claim 4
Dependent Claim
111 words
A dry planographic printing method comprising charging the surface of a dry planographic printing plate, reversal-developing said printing plate by means of a toner, transferring said toner to a transfer material, and fixing said toner; said dry planographic printing plate being prepared by charging and image-exposing a photosensitive plate including an electrically conductive support and a photoconductive layer formed on said support, said photoconductive layer comprising of a resin binder and a photoconductive powder dispersed in said binder; then developing said photosensitive plate by means of a conductive toner and fixing said conductive toner, and finally flash-irradiating the whole surface of said photosensitive plate by means of a xenon flash lamp.
Claim 5
Dependent Claim
111 words
A dry planographic printing method comprising charging the surface of a dry planographic printing plate, reversal-developing said printing plate by means of a toner, transferring said toner to a transfer material, and fixing said toner; said dry planographic printing plate being prepared by charging and image-exposing a photosensitive plate including an electrically conductive support and a photoconductive layer formed on said support, said photoconductive layer comprising of a resin binder and a photoconductive powder dispersed in said binder; then developing said photosensitive plate by means of a conductive toner and fixing said conductive toner, and finally flash-irradiating the whole surface of said photosensitive plate by means of a xenon flash lamp.
Claim 6
Dependent Claim
27 words
A dry planographic printing method according to claim 3, wherein said photoconductive layer consists essentially of said resin binder and said photoconductive powder disbursed in said binder.
References Cited (Backward Citations)
US3918971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |