Patent US3857976A successfully refreshed from Google Patents.
Patent US4457971A successfully refreshed from Google Patents.
US4457971A
Expired / Lapsed
US
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Lithographic substrate and its process of manufacture
Assignee: 3M Co
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Filing: 1982-08-26
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Granted: 1984-07-03
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Expires: 2002-08-26
Abstract
Abstract Lithographic printing substrates ordinarily require a mechanical or chemical graining of aluminum surfaces. Such substrates are difficult and expensive to make. It has been found that lithographically suitable substrates can be prepared by the firing of monobasic phosphate solutions with dispersed particles therein. The presence of reactive metallic oxides enhances the properties of the surface.
Inventors
- 👤 Donald E. Cadwell
- 👤 Larry A. Brey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:14
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/006; B41N3/00; B41N3/03; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/126; Y10T; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/256; Y10T428/257; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A photosensitive article comprising: A. an aluminum or aluminized substrate in the form of a film or sheet bearing on at least one aluminum or aluminized surface thereof a hydrophilic ceramic layer comprising (1) non-metallic inorganic particles and (2) a water-resistant phase, or phases, of a dehydration product of at least one monobasic phosphate; said ceramic layer having a thickness between 0.2 and 15 micrometers and B. a photosensitive lithographic coating over said ceramic layer.
Claim 2
Dependent Claim
75 words
A photosensitive article comprising: A. an aluminum or aluminized substrate in the form of a film or sheet bearing on at least one aluminum or aluminized surface thereof a hydrophilic ceramic layer comprising (1) non-metallic inorganic particles and (2) a water-resistant phase, or phases, of a dehydration product of at least one monobasic phosphate; said ceramic layer having a thickness between 0.2 and 15 micrometers and B. a photosensitive lithographic coating over said ceramic layer.
Claim 3
Dependent Claim
20 words
The photosensitive article of claim 1 wherein a composition comprising an oligomeric diazonium resin is coated on said ceramic layer.
Claim 4
Dependent Claim
25 words
The photosensitive article of claim 1 wherein the cermic layer further comprises the reaction product of said at least one monobasic phosphate with said particles.
Claim 5
Dependent Claim
24 words
The photosensitive article of claim 1 wherein said particles comprise metal oxide particles having an average size of from 1×10 -3 to 45 micrometers.
Claim 6
Dependent Claim
14 words
The photosensitive article of claim 4 wherein said lithographic coating comprises a polymerizable composition.
Claim 7
Dependent Claim
45 words
The photosensitive article of claim 4 wherein said ceramic layer has a thickness between 0.2 and 15 micrometers and said substrate is aluminum in the form of a film or sheet, and said lithographic coating comprises a positive acting o-quinone diazide in a polymeric binder.
Claim 8
Dependent Claim
58 words
The photosensitive article of claim 4 wherein said ceramic layer contains a reaction product of alumina with a monobasic phosphate and a reaction product of at least one metal oxide other than alumina with a monobasic phosphate, the orthophosphate of said at least one metal oxide being insoluble in an aqueous solution having a pH of from 6-12.
Claim 9
Dependent Claim
24 words
The photosensitive article of claim 4 wherein said particles are bound into an amorphous phase of aluminum phosphates formed by dehydration of monoaluminum phosphate.
Claim 10
Dependent Claim
13 words
The photosensitive article of claim 4 wherein said metal oxide particles comprises magnesia.
Claim 11
Dependent Claim
13 words
The photosensitive article of claim 4 wherein said metal oxide particles comprise alumina.
Claim 12
Dependent Claim
18 words
The photosensitive article of claim 10 wherein said ceramic layer has a thickness between 0.5 and 5 micrometers.
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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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |