Patent US3620737A successfully refreshed from Google Patents.
US3620737A
Expired / Lapsed
US
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Etching of differentially hardened plates by enzymes
Assignee: Eastman Kodak Co
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Filing: 1968-08-09
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Granted: 1971-11-16
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Expires: 1988-08-09
Abstract
Abstract Enzymes are used to remove protein from differentially hardened proteinaceous layers particularly from layers on lithographic printing plates. The enzymes can be in a processing solution or incorporated in a photographic emulsion.
Inventors
- 👤 Doyle Owen Etter
- 👤 Merrill Wilfred Killick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:07
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; B; B41; B41N; B41N3/00; B41N3/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
13 words
An element of claim 1 in which said emulsion is an unhardened emulsion.
Claim 2
Dependent Claim
12 words
An element of claim 1 in which said enzyme is a proteinase.
Claim 3
Dependent Claim
14 words
An element of claim 1 in which said enzyme is an alkaline active enzyme.
Claim 4
Dependent Claim
11 words
An element of claim 1 in which said binder is gelatin.
Claim 5
Dependent Claim
25 words
An element of claim 1 in which said enzyme is a proteinase selected from the group consisting of ficin, pepsin, trypsin, papain, and saccharifying enzymes.
Claim 6
Dependent Claim
11 words
An element of claim 1 in which said enzyme is trypsin.
Claim 7
Dependent Claim
11 words
An element of claim 1 in which said enzyme is papain.
Claim 8
Dependent Claim
13 words
An element of claim 1 in which said enzyme is a saccharifying enzyme.
Claim 9
Dependent Claim
11 words
An element of claim 1 in which said enzyme is pepsin.
Claim 10
Dependent Claim
80 words
A process for the formation of a photographic relief image in an exposed photographic element comprising a support having thereon (1) a radiation-sensitive silver salt emulsion containing a proteinaceous colloid binder having a Shoom jelly strength greater than about 150, (2) integral with said emulsion, a silver salt tanning developing agent and (3) integral with said emulsion, an inactivated alkaline active enzyme, said process comprising activating said developing agent and said enzyme in said exposed emulsion with an alkaline activator.
Claim 11
Dependent Claim
16 words
A process of claim 11 in which said developing agent is incorporated in the said emulsion.
Claim 12
Dependent Claim
15 words
A process of claim 11 in which said enzyme is integral with said developing agent.
Claim 13
Dependent Claim
11 words
A process of claim 11 in which said binder is gelatin.
Claim 14
Dependent Claim
13 words
A process of claim 11 in which said silver salt is silver halide.
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 |