US4183788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for graining an aluminum base lithographic plate and article thereof
Assignee: Individual
•
Filing: 1978-02-28
•
Granted: 1980-01-15
•
Expires: 1998-02-28
Abstract
Abstract Planar surfaces are roughened by graining with an aqueous slurry of unfused platy, crystalline alumina. Preferably, an aluminum base with is adapted to receive a light-sensitive coating thereon to make lithographic plate is grained with said aqueous slurry.
Inventors
- 👤 Howard A. Fromson
- 👤 Robert F. Gracia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:03
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
44 words
Process for making a lithographic printing plate comprising an aluminum base which comprises graining said aluminum base with an aqueous slurry comprising unfused, platy crystalline alumina while applying a rotary brushing motion whose force vector is predominantly tangential to the surface of the aluminum.
Claim 2
Dependent Claim
44 words
Process for making a lithographic printing plate comprising an aluminum base which comprises graining said aluminum base with an aqueous slurry comprising unfused, platy crystalline alumina while applying a rotary brushing motion whose force vector is predominantly tangential to the surface of the aluminum.
Claim 3
Dependent Claim
12 words
Process of claim 1 wherein the alumina is obtained from alpha-alumina trihydrate.
Claim 4
Dependent Claim
20 words
Process of claim 1 wherein the alumina has an ultimate particle size of from about 1 to about 20 microns.
Claim 5
Dependent Claim
12 words
Process of claim 1 wherein the aluminum base is anodized after graining.
Claim 6
Dependent Claim
11 words
Process of claim 4 wherein the base is silicated after anodizing.
Claim 7
Dependent Claim
21 words
Process of claim 1 wherein the graining is carried out continuously on an aluminum web using a plurality of rotating brushes.
Claim 8
Dependent Claim
23 words
Process of claim 6 wherein the graining is carried out using one or more pairs of rotating brushes and the slurry is recirculated.
Claim 9
Dependent Claim
39 words
Lithographic printing plate comprising an aluminim base, said base being grained with an aqueous slurry of unfused, platy crystalline alumina while applying a rotary brushing motion whose force vector is predominantly tangential to the surface of the aluminum base.
Claim 10
Dependent Claim
39 words
Lithographic printing plate comprising an aluminim base, said base being grained with an aqueous slurry of unfused, platy crystalline alumina while applying a rotary brushing motion whose force vector is predominantly tangential to the surface of the aluminum base.
Claim 11
Dependent Claim
12 words
Aluminum base of claim 8 wherein the base is anodized after graining.
Claim 12
Dependent Claim
12 words
Aluminum base of claim 8 wherein the base is silicated after graining.
Claim 13
Dependent Claim
50 words
Lithographic printing plate comprising an aluminum base coated with a light-sensitive material, said base being grained with an aqueous slurry comprising unfused, platy crystalline alumina while applying a rotary brushing motion whose force vector is predominantly tangential to the surface of the aluminum base, before application of said light-sensitive coating.
Claim 14
Dependent Claim
50 words
Lithographic printing plate comprising an aluminum base coated with a light-sensitive material, said base being grained with an aqueous slurry comprising unfused, platy crystalline alumina while applying a rotary brushing motion whose force vector is predominantly tangential to the surface of the aluminum base, before application of said light-sensitive coating.
Claim 15
Dependent Claim
18 words
Lithographic printing plate of claim 11 which is anodized after graining before application of said light sensitive coating.
Claim 16
Dependent Claim
19 words
Lithographic printing plate of claim 11 which is silicated after graining and before application of said light sensitive coating.
Claim 17
Dependent Claim
21 words
Lithographic printing plate of claim 11 which is anodized and silicated after graining and before application of said light sensitive coating.
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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |