Patent US3615480A successfully refreshed from Google Patents.
US3615480A
Expired / Lapsed
US
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Developer solutions for photopolymerized layers
Assignee: EIDP Inc
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Filing: 1969-02-24
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Granted: 1971-10-26
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Expires: 1989-02-24
Abstract
Abstract An aqueous developer comprising an alkali metal silicate having a silica to alkali metal oxide ratio greater than 1.5 and one or more water-miscible organic solvents having a pH of 10.0-13.0 and capable of removing all the unexposed areas of a photopolymerizable layer containing an ethylenically unsaturated monomer of a printing form.
Inventors
- 👤 Frank Man-Kam Lam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:24
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32; G03F7/322
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
A solution according to claim 1, wherein said silicate is a sodium silicate.
Claim 2
Dependent Claim
12 words
A solution according to claim 1, wherein said solvent is a 2-alkoxyethanol.
Claim 3
Dependent Claim
11 words
A solution according to claim 1, wherein said solvent is 2-ethoxyethanol.
Claim 4
Dependent Claim
11 words
A solution according to claim 1, wherein said solvent is 2-n-butoxyethanol.
Claim 5
Dependent Claim
16 words
A solution according to claim 1 containing a small amount of polyethylene glycol alkyl phenyl ether.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |