Patent US4415654A successfully refreshed from Google Patents.
US4415654A
Expired / Lapsed
US
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Post-exposure process
Assignee: Hercules LLC
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Filing: 1982-08-19
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Granted: 1983-11-15
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Expires: 2002-08-19
Abstract
Abstract Disclosed is the improvement in post-exposing relief printing plates prepared from photosensitive polymeric compositions which comprises immersing the relief printing plate in a dilute aqueous solution of a persulfate salt and a sufficient amount of a water-soluble carboxylic acid to provide a pH of about 1.5 to about 2.5 during exposure to actinic radiation.
Inventors
- 👤 Rudolph L. Pohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:50
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/20; G03F7/2022; G03F7/2024
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
In the process of post-exposing to actinic radiation a relief printing plate prepared from a photosensitive polymeric composition, the improvement which comprises said relief printing plate being immersed during said post-exposing in a dilute aqueous solution of a persulfate salt and a sufficient amount of a water-soluble carboxylic acid to produce a pH of about 1.5 to about 2.5.
Claim 2
Dependent Claim
59 words
In the process of post-exposing to actinic radiation a relief printing plate prepared from a photosensitive polymeric composition, the improvement which comprises said relief printing plate being immersed during said post-exposing in a dilute aqueous solution of a persulfate salt and a sufficient amount of a water-soluble carboxylic acid to produce a pH of about 1.5 to about 2.5.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said actinic radiation is ultraviolet radiation.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein said photosensitive polymeric composition is a liquid.
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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |