US4201836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum substrates grained with a saturated solution of aluminum salts of mineral acids
Assignee: Polychrome Corp
•
Filing: 1978-08-28
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Granted: 1980-05-06
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Expires: 1998-08-28
Abstract
Abstract A method for the production of aluminum substrates useful in the production of lithographic printing plates which comprises graining the surface of an aluminum sheet in a saturated solution of an aluminum salt of a mineral acid to which up to 10% of a mineral acid has been added, with optional electrolysis.
Inventors
- 👤 Jen-Chi Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:31
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/20; B; B41; B41N; B41N3/00; B41N3/03; B41N3/034; Y; Y10; Y10S; Y10S428/00; Y10S428/908; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
41 words
A process for the treatment of an aluminum sheet to provide thereon a substantially consistent and uniformly roughened surface suitable for lithographic uses, which comprises immersing said aluminum in a saturated aqueous solution of an aluminum salt of a mineral acid.
Claim 2
Dependent Claim
41 words
A process for the treatment of an aluminum sheet to provide thereon a substantially consistent and uniformly roughened surface suitable for lithographic uses, which comprises immersing said aluminum in a saturated aqueous solution of an aluminum salt of a mineral acid.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the time of immersion of said aluminum in said solution is from about 30 seconds to about 5 minutes.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein said solution further comprises up to about 10% by weight of a mineral acid.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein said aluminum is electrolyzed in said solution.
Claim 6
Dependent Claim
13 words
The process of claim 3 wherein the aluminum is electrolyzed in said solution.
Claim 7
Dependent Claim
24 words
The process of claim 1 wherein said aluminum salt is selected from the group consisting of aluminum chloride, sulfate, phosphate, borate, acetate and nitrate.
Claim 8
Dependent Claim
28 words
The process of claim 3 wherein said acid is selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, boric acid, nitric acid and acetic acid.
Claim 9
Dependent Claim
18 words
The process of claim 3 wherein said acid is hydrochloric acid and said aluminum salt is aluminum chloride.
Claim 10
Dependent Claim
10 words
The aluminum sheet produced by the method of claim 1.
Claim 11
Dependent Claim
25 words
A lithographic printing plate which comprises the aluminum sheet produced by the method of claim 1 and a lithographically suitable photosensitizer coated on said sheet.
Claim 12
Dependent Claim
18 words
The process of claim 1 wherein the solution temperature is maintained at from 25° C. to 110° C.
Claim 13
Dependent Claim
16 words
The process of claim 11 wherein the solution temperature ranges from 50° C. to 60° C.
Claim 14
Dependent Claim
28 words
The process of claim 4 wherein the electrolysis is conducted by a current density of from 5 to 30 amperes per square decimeter for up to three minutes.
Claim 15
Dependent Claim
14 words
The process of claim 1 which comprises the subsequent step of anodizing said sheet.
Claim 16
Dependent Claim
52 words
A lithographic printing plate prepared by a process which comprises immersing an aluminum sheet in a saturated solution of aluminum chloride or aluminum nitrate maintained at from 25° C. to 110° C. for from 30 seconds to 5 minutes; then anodizing said sheet; and coating a lithographically suitable photosensitizer on said sheet.
Claim 17
Dependent Claim
52 words
A lithographic printing plate prepared by a process which comprises immersing an aluminum sheet in a saturated solution of aluminum chloride or aluminum nitrate maintained at from 25° C. to 110° C. for from 30 seconds to 5 minutes; then anodizing said sheet; and coating a lithographically suitable photosensitizer on said sheet.
Claim 18
Dependent Claim
22 words
The lithographic printing plate of claim 15 wherein said solution further comprises up to 10% by weight of hydrochloric or nitric acid.
Claim 19
Dependent Claim
63 words
A lithographic printing plate prepared by a process which comprises electrolyzing an aluminum sheet in a saturated solution of aluminum chloride or aluminum nitrate maintained at from 25° C. to 110° C. for up to 3 minutes at a current density of from 5 to 30 amperes per square decimeter; then anodizing said sheet; and coating a lithographically suitable photosensitizer on said sheet.
Claim 20
Dependent Claim
63 words
A lithographic printing plate prepared by a process which comprises electrolyzing an aluminum sheet in a saturated solution of aluminum chloride or aluminum nitrate maintained at from 25° C. to 110° C. for up to 3 minutes at a current density of from 5 to 30 amperes per square decimeter; then anodizing said sheet; and coating a lithographically suitable photosensitizer on said sheet.
Claim 21
Dependent Claim
22 words
The lithographic printing plate of claim 17 wherein said solution further comprises up to 10% by weight of hydrochloric or nitric acid.
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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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |