US4191570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for heat treating lithographic printing plates
Assignee: Polychrome Corp
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Filing: 1978-10-10
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Granted: 1980-03-04
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Expires: 1998-10-10
Abstract
Abstract A process for producing a planographic printing plate comprising subjecting a light sensitive planographic printing plate member to a burning in wherein the light sensitive planographic printing plate member is treated with an aqueous solution of the reaction product of naphthalene, formaldehyde, and sulfuric acid prior to such burning in treatment.
Inventors
- 👤 Hans-Peter Herting
- 👤 Wolfgang J. Rebner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:36
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/40; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
A process for producing a lithographic printing plate comprising exposing and developing a light-sensitive printing plate; coating the exposed and developed surface of said plate with an aqueous solution of a compound selected from the group consisting of condensed aryl sulfonates or the metal salts thereof; drying said coating and then subjecting said treated plate to a burning-in without removal of said coating composition from said surface.
Claim 2
Dependent Claim
67 words
A process for producing a lithographic printing plate comprising exposing and developing a light-sensitive printing plate; coating the exposed and developed surface of said plate with an aqueous solution of a compound selected from the group consisting of condensed aryl sulfonates or the metal salts thereof; drying said coating and then subjecting said treated plate to a burning-in without removal of said coating composition from said surface.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein the light-sensitive planographic plate member comprises a support of aluminum.
Claim 4
Dependent Claim
11 words
A lithographic printing plate produced by the process of claim 2.
Claim 5
Dependent Claim
19 words
The process of claim 1, therein the burning-in temperature is about 180 degrees C. to about 350 degrees C.
Claim 6
Dependent Claim
19 words
The process of claim 4, wherein the burning-in is conducted in a period of from 3 to 20 minutes.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein the light-sensitive printing plate comprises an o-quinone diazide type light-sensitive material.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein the light-sensitive printing plate comprises a photosensitive composition selected from the group consisting of diazonium salts, azide compounds and photopolymerizable compounds.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein the condensed aryl sulfonate is the reaction product of naphthalene, formaldehyde and sulfuric acid.
Claim 10
Dependent Claim
24 words
The process of claim 1 wherein the condensed aryl sulfonate is the sodium salt of the reaction product of naphthalene, formaldehyde and sulfuric acid.
Claim 11
Dependent Claim
11 words
The lithographic printing plate produced by the process of claim 9.
References Cited (Backward Citations)
US2802845A
Cited
GB1151199A
Cited
GB1154749A
Cited
US4062682A
Cited
US4063507A
Cited
US4101322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |