Patent US3949142A successfully refreshed from Google Patents.
US3949142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry planographic plate
Assignee: Warren SD Co
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Filing: 1973-07-31
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Granted: 1976-04-06
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Expires: 1993-07-31
Abstract
Abstract A new dry planographic plate having a non-ink receptive silicone rubber background area that does not require a fountain solution to repel printing ink and process of producing this new plate comprising applying the photoresponsive sensitizer to a polymeric support film and bringing the sensitizer layer into intimate adhesive contact with an uncured silicone gum and thereafter curing the silicone gum.
Inventors
- 👤 Towers Doggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:38
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/075; G03F7/0752; B; B41; B41N; B41N1/00; B41N1/003; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24926; Y10T428/24934; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
91 words
A dry planographic printing plate comprising a substrate, and at least three additional layers disposed in superimposed relation to each other: 1. a silicone rubber layer adhesively bonded to at least one surface of the substrate, 2. a photoresponsive sensitizer layer adhesively bonded to the silicone rubber layer, said adhesive bond being formed by curing a layer of silicone gum while it is in physical contact with said substrate and sensitizer layer; and 3. overlying the sensitizer layer, a polymeric film permeable to the liquid used to develop the exposed plate.
Claim 2
Dependent Claim
91 words
A dry planographic printing plate comprising a substrate, and at least three additional layers disposed in superimposed relation to each other: 1. a silicone rubber layer adhesively bonded to at least one surface of the substrate, 2. a photoresponsive sensitizer layer adhesively bonded to the silicone rubber layer, said adhesive bond being formed by curing a layer of silicone gum while it is in physical contact with said substrate and sensitizer layer; and 3. overlying the sensitizer layer, a polymeric film permeable to the liquid used to develop the exposed plate.
Claim 3
Dependent Claim
14 words
The plate according to claim 1 wherein the photoresponsive sensitizer is a diazo sensitizer.
Claim 4
Dependent Claim
24 words
The plate according to claim 2 wherein the diazo sensitizer is water soluble when unexposed and becomes water insoluble when exposed to actinic radiation.
Claim 5
Dependent Claim
32 words
The plate according to claim 3 wherein the polymeric film is reacted upon by the exposed photoresponsive diazo sensitizer and thus becomes firmly bonded to the sensitizer in the exposed image areas.
Claim 6
Dependent Claim
24 words
The plate according to claim 2 wherein the diazo sensitizer is water insoluble when unexposed and becomes water soluble when exposed to actinic radiation.
Claim 7
Dependent Claim
20 words
The plate according to claim 1 further comprising a carrier sheet overlying and in releasible contact with the polymeric film.
Claim 8
Dependent Claim
87 words
A dry planographic printing plate comprising a substrate, and at least two additional layers disposed in superimposed relation to each other and both overlying the substrate, 1. a silicone rubber layer adhesively bonded to at least one surface of the substrate; and 2. overlying and adhesively bonded to the silicone rubber layer, a water soluble polymeric film having a diazo photosensitizer dispersed therein, said adhesive bond being formed by curing a layer of silicone gum while it is in physical contact with said substrate and said film.
Claim 9
Dependent Claim
87 words
A dry planographic printing plate comprising a substrate, and at least two additional layers disposed in superimposed relation to each other and both overlying the substrate, 1. a silicone rubber layer adhesively bonded to at least one surface of the substrate; and 2. overlying and adhesively bonded to the silicone rubber layer, a water soluble polymeric film having a diazo photosensitizer dispersed therein, said adhesive bond being formed by curing a layer of silicone gum while it is in physical contact with said substrate and said film.
Claim 10
Dependent Claim
23 words
The plate according to claim 7 wherein the diazo sensitizer is water soluble when unexposed and water insoluble when exposed to actinic radiation.
Claim 11
Dependent Claim
31 words
The plate according to claim 8 wherein the polymeric film is reacted upon by the exposed diazo sensitizer and thus becomes firmly boned to the sensitizer in the exposed image areas.
Claim 12
Dependent Claim
24 words
The plate according to claim 7 wherein the diazo sensitizer is water insoluble when unexposed and becomes water soluble when exposed to actinic radiation.
Claim 13
Dependent Claim
20 words
The plate according to claim 7 further comprising a carrier sheet overlying and in releasible contact with the polymeric film.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |