Patent US4350756A successfully refreshed from Google Patents.
US4350756A
Expired / Lapsed
US
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Processing of radiation sensitive plates
Assignee: Agfa Gevaert NV
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Filing: 1981-02-04
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Granted: 1982-09-21
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Expires: 2001-02-04
Abstract
Abstract A developer for processing image-wise exposed negative-working radiation sensitive plates based on organic solvent soluble diazo resins or certain photocrosslinkable resins or photopolymerizable olefinically unsaturated compounds includes a surfactant and a salt of an aliphatic carboxylic acid containing up to nine carbon atoms. The developer is substantially aqueous and has a reduced tendency to foam formation. It is useful in the photomechanical production of lithographic printing plates.
Inventors
- 👤 Jeremy R. Burch
- 👤 David E. Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:04
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
43 words
A substantially aqueous developer for processing image-wise exposed negative working radiation sensitive plates which comprises an aqueous solution of a non-ionic surfactant, a salt of an aromatic carboxylic acid, and a salt of an aliphatic carboxylic acid containing up to nine carbon atoms.
Claim 2
Dependent Claim
43 words
A substantially aqueous developer for processing image-wise exposed negative working radiation sensitive plates which comprises an aqueous solution of a non-ionic surfactant, a salt of an aromatic carboxylic acid, and a salt of an aliphatic carboxylic acid containing up to nine carbon atoms.
Claim 3
Dependent Claim
22 words
A developer as claimed in claim 2 wherein the surfactant is an alcohol alcoxylate, a modified alcohol alcoxylate, or a phenol alcoxylate.
Claim 4
Dependent Claim
17 words
A developer as claimed in claim 2, and containing from 5 to 30% v/v of the surfactant.
Claim 5
Dependent Claim
22 words
A developer as claimed in claim 1 wherein the aliphatic carboxylic acid is propanoic acid, valeric acid, sorbic acid or nonanoic acid.
Claim 6
Dependent Claim
18 words
A developer as claimed in claim 1 wherein the aliphatic carboxylic acid contains 7 or 8 carbon atoms.
Claim 7
Dependent Claim
21 words
A developer as claimed in claim 5 wherein the aliphatic carboxylic acid is heptanoic acid, octanoic acid or 2-ethyl hexanoic acid.
Claim 8
Dependent Claim
24 words
A developer as claimed in claim 1 and containing from 20 to 300 grams per liter of the salt of the aliphatic carboxylic acid.
Claim 9
Dependent Claim
23 words
A developer as claimed in claim 1 and containing up to 300 grams per liter of the salt of the aromatic carboxylic acid.
Claim 10
Independent Claim
54 words
A method of processing an imagewise exposed negative working radiation sensitive plate which comprises the step of developing the plate using a substantially aqueous developer comprising an aqueous solution of a non-ionic surfactant, a salt of an aromatic carboxylic acid, and a salt of an aliphatic carboxylic acid containing up to nine carbon atoms.
Claim 11
Independent Claim
54 words
A method of processing an imagewise exposed negative working radiation sensitive plate which comprises the step of developing the plate using a substantially aqueous developer comprising an aqueous solution of a non-ionic surfactant, a salt of an aromatic carboxylic acid, and a salt of an aliphatic carboxylic acid containing up to nine carbon atoms.
Claim 12
Dependent Claim
34 words
A method in accordance with claim 9 wherein the radiation sensitive plate has a radiation sensitive coating based on an organic solvent soluble diazo resin, a photocrosslinkable resin or a photopolymerisable olefinically unsaturated compound.
Claim 13
Dependent Claim
18 words
A developer as claimed in claim 1 wherein the aromatic carboxylic acid is benzoic acid or toluic acid.
Claim 14
Dependent Claim
18 words
A method in accordance with claim 9 wherein the aromatic carboxylic acid is benzoic acid or toluic acid.
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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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |