Patent US4621041A successfully refreshed from Google Patents.
US4621041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic printing plate
Assignee: Mitsubishi Paper Mills Ltd
•
Filing: 1984-07-11
•
Granted: 1986-11-04
•
Expires: 2004-07-11
Abstract
Abstract Disclosed is a method for plate-making which comprises imagewise exposing by scanning type flash exposure a lithographic printing plate comprising a support and at least a silver halide emulsion layer containing at least 70 mol % of silver chloride and prepared with addition of a water soluble iridium compound during emulsification or physical ripening of silver halide and a water soluble gold compound at any time before coating of the emulsion and thereafter subjecting the exposed emulsion to diffusion transfer development.
Inventors
- 👤 Masahiko Saikawa
- 👤 Eiji Kanada
- 👤 Kazunaka Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:04
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03F7/07
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
86 words
A method for plate-making which comprises image-wise exposing by scanning flash exposure a lithographic printing plate comprising a support, a physical development nuclei containing surface layer and at least an unfogged silver halide emulsion layer containing at least 70 mol % of silver chloride and prepared with addition of a water soluble iridium compound during emulsification or physical ripening of the emulsion and a water soluble gold compound at any time before coating of the emulsion and thereafter subjecting the exposed emulsion to diffusion transfer development.
Claim 2
Independent Claim
86 words
A method for plate-making which comprises image-wise exposing by scanning flash exposure a lithographic printing plate comprising a support, a physical development nuclei containing surface layer and at least an unfogged silver halide emulsion layer containing at least 70 mol % of silver chloride and prepared with addition of a water soluble iridium compound during emulsification or physical ripening of the emulsion and a water soluble gold compound at any time before coating of the emulsion and thereafter subjecting the exposed emulsion to diffusion transfer development.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein the water soluble iridium compound is added during emulsification of the silver halide.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein the water soluble iridium compound is added during physical ripening of the emulsion.
Claim 5
Dependent Claim
29 words
A method according to claim 1 wherein the water soluble iridium compound is added in an amount of 10 -8 -10 -4 mol per one mol of silver halide.
Claim 6
Dependent Claim
29 words
A method according to claim 1 wherein the water soluble gold compound is added in an amount of 10 -6 -10 -2 mol per one mol of silver halide.
Claim 7
Dependent Claim
27 words
A method according to claim 1 wherein the silver halide emulsion is selected from silver chloride, silver chlorobromide and silver chlorobromoiodide containing 0.1-2 mol of silver iodide.
Claim 8
Dependent Claim
36 words
A method according to claim 1 wherein the silver halide emulsion is a monodispersed emulsion where at least 90% of all silver halide grains have grain size within the range of ±30% of average grain size.
Claim 9
Dependent Claim
17 words
A method according to claim 1 wherein average grain size of the silver halide emulsion is 0.2-0.6μ.
Claim 10
Dependent Claim
17 words
A method according to claim 1 wherein the silver halide emulsion contains a betaine cyanine sensitizing dye.
Claim 11
Dependent Claim
17 words
A method according to claim 1 wherein the silver halide emulsion contains an anion cyanine sensitizing dye.
Claim 12
Dependent Claim
16 words
A method according to claim 1 wherein the scanning type exposure is performed by laser beam.
Claim 13
Dependent Claim
16 words
A method according to claim 1 wherein the scanning type exposure is performed by light-emitting diode.
Claim 14
Dependent Claim
17 words
A method according to claim 1 wherein the scanning type exposure is performed by cathode ray tube.
Claim 15
Dependent Claim
28 words
A method according to claim 1 wherein the water soluble iridium compound is iridium chloride, hexahalogenoiridic acid (III) or salts thereof or hexahalogenoiridic acid (IV) or salts thereof.
Claim 16
Dependent Claim
27 words
A method according to claim 1 wherein the water soluble gold compound is chloroauric acid, potassium chloroaurate, auric trichloride, potassium auric thiocyanate, potassium iodoaurate or ammonium aurothiocyanate.
Claim 17
Dependent Claim
21 words
A method according to claim 1 wherein the unfogged halide emulsion layer contains at least 80 mol % of silver chloride.
Claim 18
Independent Claim
98 words
A method of printing which comprises printing in a printing machine with the lithographic printing plate made by image-wise exposing by scanning flash exposure a lithographic printing plate comprising a support, a physical developement nuclei containing surface layer and at least an unfogged silver halide emulsion layer containing at least 70 mol % of silver chloride and prepared with addition of a water soluble iridium compound during emulsification or physical ripening of the emulsion and a water soluble gold compound at any time before coating of the emulsion and thereafter subjecting the exposed emulsion of diffusion transfer development.
Claim 19
Independent Claim
98 words
A method of printing which comprises printing in a printing machine with the lithographic printing plate made by image-wise exposing by scanning flash exposure a lithographic printing plate comprising a support, a physical developement nuclei containing surface layer and at least an unfogged silver halide emulsion layer containing at least 70 mol % of silver chloride and prepared with addition of a water soluble iridium compound during emulsification or physical ripening of the emulsion and a water soluble gold compound at any time before coating of the emulsion and thereafter subjecting the exposed emulsion of diffusion transfer development.
References Cited (Backward Citations)
US3890154A
Cited
US4126472A
Cited
US4173483A
Cited
US4134769A
Cited
US4134769B1
Cited
US4288535A
Cited
US4495274A
Cited
US4469783A
Cited
US4501811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |