US4339315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing lithographic printing plate bases
Assignee: Mitsubishi Chemical Corp
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Filing: 1981-03-06
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Granted: 1982-07-13
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Expires: 2001-03-06
Abstract
Abstract There is disclosed a process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an aqueous electrolytic solution containing hydrochloric acid and citric or malic acid at a bath temperature of 10 DEG to 40 DEG C.
Inventors
- 👤 Nobuji Kikuchi
- 👤 Yoshiyuki Kisaka
- 👤 Kazuo Torige
- 👤 Masayuki Onose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:53
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/034; C; C25; C25F; C25F3/00; C25F3/02; C25F3/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12229; Y10T428/12993
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
52 words
A process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an aqueous electrolytic solution containing 0.1 to 1 mole/l of hydrochloric acid and 0.01 to 1 mole/l of citric or malic at a bath temperature of 10° to 40° C.
Claim 2
Dependent Claim
52 words
A process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an aqueous electrolytic solution containing 0.1 to 1 mole/l of hydrochloric acid and 0.01 to 1 mole/l of citric or malic at a bath temperature of 10° to 40° C.
Claim 3
Dependent Claim
17 words
The process according to claim 1, wherein the aqueous electrolytic solution contains hydrochloric acid and citric acid.
Claim 4
Dependent Claim
17 words
The process according to claim 1, wherein the aqueous electrolytic solution contains hydrochloric acid and malic acid.
Claim 5
Dependent Claim
19 words
The process according to claim 1, wherein the bath temperature is in the range of 10° to 30° C.
Claim 6
Dependent Claim
23 words
The process according to claim 1, wherein the sheet is electrolytically etched at a current density of 20 to 200 A/dm 2 .
Claim 7
Dependent Claim
68 words
A process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an aqueous electrolytic solution containing 0.1 to 1 mole/l of hydrochloric and 0.01 to 1 mole/l of citric or malic acid at a bath temperature of 10° to 40° C., and thereafter anodizing the sheet in an aqueous electrolytic solution containing sulfuric acid or phosphoric acid.
Claim 8
Dependent Claim
68 words
A process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an aqueous electrolytic solution containing 0.1 to 1 mole/l of hydrochloric and 0.01 to 1 mole/l of citric or malic acid at a bath temperature of 10° to 40° C., and thereafter anodizing the sheet in an aqueous electrolytic solution containing sulfuric acid or phosphoric acid.
Claim 9
Dependent Claim
23 words
The process according to claim 6, wherein the etched sheet is anodized at a current density of 1 to 10 A/dm 2 .
Claim 10
Dependent Claim
23 words
The process according to claim 6, wherein the concentration of sulfuric acid or phosphoric acid is in the range of 10 to 50%.
Claim 11
Dependent Claim
12 words
A lithographic printing plate base prepared by the process of claim 1.
Claim 12
Dependent Claim
12 words
A lithographic printing plate base prepared by the process of claim 6.
Claim 13
Dependent Claim
11 words
A lithographic printing plate prepared by the process of claim 5.
References Cited (Backward Citations)
US3975245A
Cited
US4172772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |