US3971316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for smoothing waterless lithographic masters
Assignee: Xerox Corp
•
Filing: 1974-05-28
•
Granted: 1976-07-27
•
Expires: 1994-05-28
Abstract
Abstract A method of removing irregularities on the surface of a waterless lithographic master comprising selectively heating an imaged adhesive silicone master, which is deformable at elevated temperature, at a temperature and for a time sufficient to smooth out irregularities in the surface of the master.
Inventors
- 👤 Richard L. Schank
- 👤 Wolfgang H. H. Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:06
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/003; B41C; B41C1/00; B41C1/10; B41C2210/00; B41C2210/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
86 words
A method of removing irregularities on the surface of a waterless lithographic master comprising providing a waterless lithographic master comprising an adhesive silicone which is deformable at elevated temperature and having an image formed of depressions in the silicone, said master additionally having surface irregularities in the non-imaged areas which accept ink or surface irregularities in the imaged areas resulting in a lack of clarity; selectively heating said master at a temperature and for a time sufficient to smooth out said irregularities without collapsing the image.
Claim 2
Independent Claim
86 words
A method of removing irregularities on the surface of a waterless lithographic master comprising providing a waterless lithographic master comprising an adhesive silicone which is deformable at elevated temperature and having an image formed of depressions in the silicone, said master additionally having surface irregularities in the non-imaged areas which accept ink or surface irregularities in the imaged areas resulting in a lack of clarity; selectively heating said master at a temperature and for a time sufficient to smooth out said irregularities without collapsing the image.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein a particulate material is deposited in said imaged depressions to protect the imaged areas during the heat treatment.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein the particulate material is relatively insensitive to heat.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein the master comprises a silicone formed of a gum having reactive pendant groups capped with monofunctional compounds.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein the master comprises a silicone which can be cured by light.
Claim 7
Independent Claim
97 words
A method of preparing a waterless lithographic master comprising providing a suitable master substrate and a silicone which is curable by electromagnetic activating radiation to an adhesive condition and deformable by heat or mechanical application, depositing said silicone on said substrate, mechanically deforming said silicone by generating ink accepting depressions therein, curing said silicone in an imagewise configuration by the application of activating electromagnetic radiation, heating said silicone to smooth out deformations in the non-imaged areas without collapsing the image, and subjecting said silicone to activating electromagnetic radiation to fully cure the silicone to an adhesive condition.
Claim 8
Independent Claim
97 words
A method of preparing a waterless lithographic master comprising providing a suitable master substrate and a silicone which is curable by electromagnetic activating radiation to an adhesive condition and deformable by heat or mechanical application, depositing said silicone on said substrate, mechanically deforming said silicone by generating ink accepting depressions therein, curing said silicone in an imagewise configuration by the application of activating electromagnetic radiation, heating said silicone to smooth out deformations in the non-imaged areas without collapsing the image, and subjecting said silicone to activating electromagnetic radiation to fully cure the silicone to an adhesive condition.
Claim 9
Independent Claim
94 words
A method of preparing a waterless lithographic printing master comprising providing a printing master having a surface layer of a silicone curable by activating electromagnetic radiation to an adhesive condition and softenable by heat, and having closely spaced depressions sufficient to trap printing ink and permit an image to be formed therein, imagewise curing said master by activating electromagnetic radiation, heating the depressions to selectively collapse said depressions and form a relatively level non-imaged area, and subjecting said non-imaged area to activating electromagnetic radiation to cure said area to an adhesive ink releasing condition.
Claim 10
Independent Claim
94 words
A method of preparing a waterless lithographic printing master comprising providing a printing master having a surface layer of a silicone curable by activating electromagnetic radiation to an adhesive condition and softenable by heat, and having closely spaced depressions sufficient to trap printing ink and permit an image to be formed therein, imagewise curing said master by activating electromagnetic radiation, heating the depressions to selectively collapse said depressions and form a relatively level non-imaged area, and subjecting said non-imaged area to activating electromagnetic radiation to cure said area to an adhesive ink releasing condition.
Claim 11
Dependent Claim
22 words
The process of claim 7 wherein the master comprises a photocrosslinkable silicone which is imagewise cured prior to collapsing the non-imaged areas.
Claim 12
Dependent Claim
15 words
The process of claim 8 wherein the master is imaged by a scanning light beam.
Claim 13
Dependent Claim
14 words
The process of claim 8 wherein the master is imaged with an electron beam.
Claim 14
Dependent Claim
31 words
The process of claim 7 wherein a particulate material is deposited in imagewise configuration prior to collapsing the non-imaged areas and the particulate material removed after the non-imaged areas are collapsed.
References Cited (Backward Citations)
US2559539A
Cited
US2823146A
Cited
US2849752A
Cited
US3063872A
Cited
US3215527A
Cited
US3221654A
Cited
US3362017A
Cited
US3273498A
Cited
US3677178A
Cited
US3455239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |