Patent US3673962A successfully refreshed from Google Patents.
US3673962A
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Lithographic duplicating method and lithoplate master therefore
Assignee: 3M Co
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Filing: 1970-09-23
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Granted: 1972-07-04
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Expires: 1990-09-23
Abstract
Abstract A high quality long run lithographic printing plate is produced by applying an alpha-naphthol first reactant at image areas to a lithoplate master containing as co-reactants for the alphanaphthol both ionic iodide compound and ionic chromium compound, and heating the plate.
Inventors
- 👤 Burt K Sagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:51
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/10; B41C1/1091
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
24 words
Method of claim 1 wherein said alpha-naphthol is applied by transfer from a uniformly coated source sheet held in face-to-face contact with said master.
Claim 2
Dependent Claim
20 words
Method of claim 2 wherein said source sheet is heated at least at image-defining areas during transfer of said alpha-naphthol.
Claim 3
Dependent Claim
25 words
Method of claim 3 wherein said source sheet is locally heated at image-defining areas by exposure of a differentially radiation-absorbtive imaged original to intense radiation.
Claim 4
Dependent Claim
30 words
Method of claim 3 wherein said source sheet is uniformly heated during transfer of said alpha-naphthol and wherein said alpha-naphthol is present on said source sheet only at image-defining areas.
Claim 5
Dependent Claim
50 words
Method of claim 5 including the step of preparing the source sheet by reflex exposure of a graphic original to actinic radiation applied through said source sheet, in contact with said original, said source sheet initially having a uniform coating of a said alpha-naphthol which is desensitizable by said radiation.
Claim 6
Dependent Claim
17 words
A lithoplate master including a preferentially hydrophilic printing layer containing ionic iodide compound and ionic chromium compound.
Claim 7
Dependent Claim
23 words
Lithoplate master of claim 7 wherein said iodide compound and chromium compound comprise an intimate mixture at the surface of said hydrophilic layer.
Claim 8
Dependent Claim
12 words
Lithoplate master of claim 8 wherein said chromium compound is a dichromate.
Claim 9
Dependent Claim
11 words
Lithoplate master of claim 9 wherein said compound is potassium dichromate.
Claim 10
Dependent Claim
32 words
Lithoplate master of claim 7 wherein said ionic chromium compound is present to the extent of about 5 to about 50 parts by weight per 100 parts by weight of ionic iodide.
Claim 11
Dependent Claim
33 words
A paper lithoplate master including a paper base and a preferentially hydrophilic coating comprising a hydrophilic water-insoluble binder and a hydrophilic particulate filler, said coating containing ionic iodide compound and ionic chromium compound.
Claim 12
Dependent Claim
23 words
Lithoplate master of claim 11 wherein the concentration of said iodide and chromium compounds is highest adjacent the exposed surface of said coatIng.
Claim 13
Dependent Claim
42 words
A lithoplate including a preferentially hydrophilic printing layer having thereon an oleophilic ink-receptive image which comprises the product of a first co-reactant comprising at least one light-sensitive substituted alpha-naphthol and a second co-reactant comprising both ionic iodide compound and ionic chromium compound.
Claim 14
Dependent Claim
11 words
The imaged lithoplate of claim 14 wherein said alpha-naphthol is 4-methoxy-1-naphthol.
Claim 15
Dependent Claim
14 words
The imaged lithoplate of claim 14 wherein said ionic chromium compound is a dichromate.
Claim 16
Dependent Claim
22 words
The imaged lithoplate of claim 15 wherein the ionic iodide is an ammonium iodide and the ionic chromium compound is potassium dichromate.
Claim 17
Dependent Claim
33 words
In a method of making a lithoplate master having a hydrophilic printing layer including an ionic iodide compound, the improvement comprising incorporating with said iodide compound, a minor amount of ionic chromium compound.
Claim 18
Dependent Claim
11 words
Method of claim 18 wherein said chromium compound is a dichromate.
Claim 19
Dependent Claim
10 words
Method of claim 19 wherein said dichromate is potassium dichromate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |