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 23:24
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.
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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) | 1980-07-18 | 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 |