Patent US4355090A successfully refreshed from Google Patents.
US4355090A
Expired / Lapsed
US
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Method for making a diffusion transfer lithographic printing plates with oxazolidones
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1980-07-01
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Granted: 1982-10-19
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Expires: 2000-07-01
Abstract
Abstract Method for making lithographic printing plates by silver salt diffusion transfer process is disclosed. That is, lithographic printing plates having excellent printing endurance are obtained by carrying out the diffusion transfer processing in the presence of a compound having the ring structure ##STR1## which may be present in at least one constitutive layer of the printing plate materials (photographic materials) used for making the printing plates or in the diffusion transfer processing solution.
Inventors
- 👤 Shoji Yamada
- 👤 Eiji Kanada
- 👤 Kozo Haino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:23
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03F7/063
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
45 words
Method for making a lithographic printing plate by the silver salt diffusion transfer development process after exposure of the plate, characterized in that the diffusion transfer development processing is carried out in the presence of a compound having the ring structure of the formula: ##STR6##
Claim 2
Dependent Claim
45 words
Method for making a lithographic printing plate by the silver salt diffusion transfer development process after exposure of the plate, characterized in that the diffusion transfer development processing is carried out in the presence of a compound having the ring structure of the formula: ##STR6##
Claim 3
Dependent Claim
63 words
Method for making a lithographic printing plate according to claim 1, wherein the compound has the following general formula: ##STR7## (wherein Z represents a condensed benzene or naphthalene ring which may or may not be present and these condensed rings when present may have substituent(s) and the 5-membered ring may have substituent(s) at 4- and/or 5-positions when the condensed ring is not present).
Claim 4
Dependent Claim
28 words
Method for making a lithographic printing plate according to claim 1 or 2, wherein the compound is present in at least one constitutive layer of printing plate material.
Claim 5
Dependent Claim
23 words
Method for making a lithographic printing plate according to claim 1 or 2, wherein the compound is present in diffusion transfer processing solution.
Claim 6
Dependent Claim
27 words
Method for making a lithographic printing plate according to claim 3, wherein the amount of the compound is about 0.001 g/m 2 -about 1 g/m 2 .
Claim 7
Dependent Claim
23 words
Method for making a lithographic printing plate, according to claim 4, wherein the amount of the compound is about 0.1 g/l-about 50 g/l.
Claim 8
Dependent Claim
19 words
Diffusion transfer processing solution useful for making lithographic printing plate which contains the compound as defined in claim 1.
Claim 9
Dependent Claim
37 words
Lithographic printing plate material having a silver halide emulsion layer and an image receiving layer used for making lithographic printing plate which contains the compound as defined in claim 1 in at least one constitutive layer thereof.
References Cited (Backward Citations)
GB922476A
Cited
US3060028A
Cited
US3385701A
Cited
UST880001I4
Cited
US3776728A
Cited
US3904412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |