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US3620734A
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Positive-working photopolymerization process
Assignee: GAF Corp
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Filing: 1968-09-09
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Granted: 1971-11-16
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Expires: 1988-09-09
Abstract
Abstract A process of photopolymerizing monomers comprising contacting said monomers with a light-sensitive diazonium salt exposing the composition to actinic radiation and subsequently immersing the composition in a processing bath which comprises a compound selected from the group consisting of ferrous ammonium sulfate or hydroquinone.
Inventors
- 👤 Edward J Cerwonka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:53
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/028; G03F7/029; C; C08; C08F; C08F2/00; C08F2/46; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/117
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
The process as defined in claim 1 wherein the reducing agent is ferrous ammonium sulfate.
Claim 2
Dependent Claim
13 words
The process as defined in claim 1 wherein the reducing agent is hydroquinone.
Claim 3
Dependent Claim
14 words
The process as defined in claim 1 wherein the diazonium compound is para-toluenediazonium fluoborate.
Claim 4
Dependent Claim
14 words
The process as defined in claim 1 wherein the diazonium compound is para-toluenediazonium chlorozincate.
Claim 5
Dependent Claim
14 words
The process as defined in claim 1 wherein the diazonium compound is para-nitrobenzenediazonium fluoborate.
Claim 6
Dependent Claim
84 words
A process of producing by photopolymerization a positive polymeric image which consists of the steps of (1) exposing to actinic radiation, a photographic element comprising a support having thereon a radiation-sensitive layer comprising a normally liquid to a normally solid monomer containing the grouping CH2 CH<, a colloid carrier therefor and an aromatic diazonium compound; (2) contacting the exposed element with a reducing agent selected from the group consisting of ferrous ammonium sulfate and hydroquinone; and (3) thereafter removing the exposed material by washing.
Claim 7
Dependent Claim
13 words
The process as defined in claim 7 wherein the reducing agent is hydroquinone.
Claim 8
Dependent Claim
15 words
The process as defined in claim 7 wherein the reducing agent is ferrous ammonium sulfate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |