Patent US3279265A successfully refreshed from Google Patents.
Patent US4361635A successfully refreshed from Google Patents.
US4361635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photolithographic element containing a silver-receptive polyaldehyde-containing receiving layer
Assignee: 3M Co
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Filing: 1981-06-19
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Granted: 1982-11-30
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Expires: 2001-06-19
Abstract
Abstract A photolithographic sheet capable of forming a lithographic printing plate upon imaging via silver salt diffusion transfer comprising a support, a silver halide emulsion, and a receptor layer overlying the emulsion, the receptor layer comprising a high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of the polymer being a dialdehyde polysaccharide.
Inventors
- 👤 Gerard H. Kinderman
- 👤 James F. Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:06
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03F7/07; G03C; G03C8/00; G03C8/24; G03C8/26; G03C8/28
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
64 words
A photolithographic light-sensitive sheet capable of providing a lithographic plate after imaging by diffusion transfer comprising a support, a silver halide emulsion layer overlying said support, and a receptor layer overlying said emulsion, said receptor layer comprising at least one high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of said polymer being a dialdehyde polysaccharide.
Claim 2
Dependent Claim
64 words
A photolithographic light-sensitive sheet capable of providing a lithographic plate after imaging by diffusion transfer comprising a support, a silver halide emulsion layer overlying said support, and a receptor layer overlying said emulsion, said receptor layer comprising at least one high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of said polymer being a dialdehyde polysaccharide.
Claim 3
Dependent Claim
20 words
The photolithographic sheet of claim 1 having an antihalation layer interposed between said silver halide emulsion layer and said support.
Claim 4
Dependent Claim
31 words
The photolithographic sheet of claim 1 wherein said dialdehyde polysaccharide is present in said receptor layer at a coating weight of from about 3 to about 250 milligrams per square meter.
Claim 5
Dependent Claim
25 words
The photolithographic sheet of claim 3 wherein said coating weight of said dialdehyde polysaccharide is from about 6 to about 100 milligrams per square meter.
Claim 6
Dependent Claim
13 words
The photolithographic sheet of claim 1 wherein said dialdehyde polysaccharide is dialdehyde starch.
Claim 7
Dependent Claim
31 words
The photolithographic sheet of claim 1 wherein said dialdehyde polysaccharide is present at a weight ratio of said catalytic nuclei of from about 1.5 to 1 to about 300 to 1.
Claim 8
Dependent Claim
21 words
The photolithographic sheet of claim 6 wherein said weight ratio is from about 20 to 1 to about 30 to 1.
Claim 9
Dependent Claim
16 words
The photolithographic sheet of claim 1 wherein said silver halide emulsion is a silver chlorobromide emulsion.
Claim 10
Dependent Claim
78 words
A lithographic plate comprising a support, a silver halide emulsion layer over said support, and a receptor layer over said emulsion layer having ink receptive image areas on the surface thereof, said receptor layer comprising a high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of said polymer being a dialdehyde polysaccharide, and said image areas comprising silver metal produced by silver salt diffusion transfer development in said receptor layer.
Claim 11
Dependent Claim
78 words
A lithographic plate comprising a support, a silver halide emulsion layer over said support, and a receptor layer over said emulsion layer having ink receptive image areas on the surface thereof, said receptor layer comprising a high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of said polymer being a dialdehyde polysaccharide, and said image areas comprising silver metal produced by silver salt diffusion transfer development in said receptor layer.
Claim 12
Dependent Claim
18 words
The lithographic plate of claim 9 having an antihalation layer interposed between said support and said emulsion layer.
Claim 13
Dependent Claim
29 words
The lithographic plate of claim 9 wherein said dialdehyde polysaccharide has a coating weight in said receptor layer of from about 3 to about 250 milligrams per square meter.
Claim 14
Dependent Claim
21 words
The lithographic plate of claim 11 wherein said coating weight is from about 6 to about 100 milligrams per square meter.
Claim 15
Dependent Claim
13 words
The lithographic plate of claim 9 wherein said dialdehyde polysaccharide is dialdehyde starch.
Claim 16
Dependent Claim
31 words
The lithographic plate of claim 9 wherein said dialdehyde polysaccharide is present at a weight ratio to said catalytic nuclei of from about 1.5 to 1 to about 300 to 1.
Claim 17
Dependent Claim
21 words
The lithographic plate of claim 14 wherein said weight ratio is from about 20 to 1 to about 30 to 1.
Claim 18
Dependent Claim
16 words
The lithographic plate of claim 9 wherein said silver halide emulsion is a silver chlorobromide emulsion.
Claim 19
Dependent Claim
77 words
A process for forming a lithographic plate comprising the steps of: (1) exposing a photolithographic element comprising a support having a silver halide emulsion thereon to actinic radiation; (2) developing said silver halide emulsion by silver salt diffusion transfer in the presence of a diffusion transfer receptor layer, said receptor layer comprising a high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of said polymer being a dialdehyde polysaccharide.
Claim 20
Dependent Claim
77 words
A process for forming a lithographic plate comprising the steps of: (1) exposing a photolithographic element comprising a support having a silver halide emulsion thereon to actinic radiation; (2) developing said silver halide emulsion by silver salt diffusion transfer in the presence of a diffusion transfer receptor layer, said receptor layer comprising a high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of said polymer being a dialdehyde polysaccharide.
Claim 21
Dependent Claim
28 words
The process of claim 17 wherein said receptor layer and said emulsion layer are both contained in an integral structure and said receptor layer overlies said emulsion layer.
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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |