Patent US4036136A successfully refreshed from Google Patents.
US4036136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona producing a planographic printing sheet
Assignee: Kansai Paint Co Ltd
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Filing: 1975-03-14
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Granted: 1977-07-19
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Expires: 1995-03-14
Abstract
Abstract A method for producing a plate or sheet useful in planographic printing which is characterized in that the surface of an oleophilic body comprising oleophilic resin is subjected to a corona discharge treatment to form a hydrophilic layer on said surface, and that said method can be carried out without difficulty at a low cost and the reproducibility of the printing plate thereby produced is excellent.
Inventors
- 👤 Tohru Takagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:36
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/032; B41C; B41C1/00; B41C1/10; B41C1/1008; B41C1/1033; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A method for producing a planographic printing plate or sheet which is characterized in that the surface of an oleophilic body comprising an oleophilic resin is subjected to a corona discharge treatment to form a hydrophilic layer on said surface, wherein said olephilic resin is polybutadiene, said corona discharge is the discharge of a sinusoidial AC voltage of 3 kHz frequency and 15,000 volts at a current of 1.8 amps, and wherein not less than 0.05 milliwatt hour of discharge current is applied to each 1 cm 2 of the surface of said body, whereby the wettability of said surface is increased.
Claim 2
Independent Claim
102 words
A method for producing a planographic printing plate or sheet which is characterized in that the surface of an oleophilic body comprising an oleophilic resin is subjected to a corona discharge treatment to form a hydrophilic layer on said surface, wherein said olephilic resin is polybutadiene, said corona discharge is the discharge of a sinusoidial AC voltage of 3 kHz frequency and 15,000 volts at a current of 1.8 amps, and wherein not less than 0.05 milliwatt hour of discharge current is applied to each 1 cm 2 of the surface of said body, whereby the wettability of said surface is increased.
Claim 3
Independent Claim
102 words
A method for producing a planographic printing plate or sheet which is characterized in that the surface of an oleophilic body comprising an oleophilic resin is subjected to a corona discharge treatment to form a hydrophilic layer on said surface, wherein said olephilic resin is polybutadiene, said corona discharge is the discharge of a sinusoidal AC voltage of 3 kHz frequency and 15,000 volts at a current of 3.6 amps, and wherein not less than 0.05 milliwatt hour of discharge current is applied to each 1 cm 2 of the surface of said body, whereby the wettability of said surface is increased.
Claim 4
Independent Claim
102 words
A method for producing a planographic printing plate or sheet which is characterized in that the surface of an oleophilic body comprising an oleophilic resin is subjected to a corona discharge treatment to form a hydrophilic layer on said surface, wherein said olephilic resin is polybutadiene, said corona discharge is the discharge of a sinusoidal AC voltage of 3 kHz frequency and 15,000 volts at a current of 3.6 amps, and wherein not less than 0.05 milliwatt hour of discharge current is applied to each 1 cm 2 of the surface of said body, whereby the wettability of said surface is increased.
References Cited (Backward Citations)
US2910723A
Cited
US2935418A
Cited
US2879396A
Cited
US3081165A
Cited
US3244546A
Cited
US3662169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |