Patent US4043879A successfully refreshed from Google Patents.
US4043879A
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Electrolytically induced polymerization utilizing bisulfite adduct free radical precursor
Assignee: Keuffel and Esser Co
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Filing: 1976-09-01
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Granted: 1977-08-23
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Expires: 1996-09-01
Abstract
Abstract Polymerization of an ethylenically unsaturated compound is achieved by means of free radical initiators derived from the reaction of an aldehyde/bisulfite adduct with cupric ions resulting from electrolysis involving a copper anode. By including a photoconductive cathode in the system image-wise light exposure effects the formation of polymeric images in the polymerizable composition.
Inventors
- 👤 Steven Levinos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:53
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/58; G; G03; G03G; G03G17/00; G03G17/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
A method of forming an image which comprises: a. providing imaging material comprising an electrically-conductive support having a surface comprising a substantial proportion of metallic copper, said surface bearing a layer of a composition comprising:
Claim 2
Independent Claim
35 words
A method of forming an image which comprises: a. providing imaging material comprising an electrically-conductive support having a surface comprising a substantial proportion of metallic copper, said surface bearing a layer of a composition comprising:
Claim 3
Dependent Claim
113 words
a polymerizable ethylenically unsaturated compound, and 2. an aldehyde/bisulfite adduct; b. contacting the exposed surface of said layer with a cathode exhibiting a pattern of electrical conductivity corresponding to said image; c. arranging a source of electrical potential in circuit with said cathode and said electrically-conductive support, said support constituting the anode of the arrangement; d. causing electrical current to flow through said layer in accordance with said image pattern of said cathode, thereby effecting image-wise migration of cupric ions into and generation of polymerization-inducing species in said composition layer with concurrent polymerization of said polymerizable compound; e. separating said cathode from said composition layer; and f. removing unpolymerized composition from said layer.
Claim 4
Dependent Claim
113 words
a polymerizable ethylenically unsaturated compound, and 2. an aldehyde/bisulfite adduct; b. contacting the exposed surface of said layer with a cathode exhibiting a pattern of electrical conductivity corresponding to said image; c. arranging a source of electrical potential in circuit with said cathode and said electrically-conductive support, said support constituting the anode of the arrangement; d. causing electrical current to flow through said layer in accordance with said image pattern of said cathode, thereby effecting image-wise migration of cupric ions into and generation of polymerization-inducing species in said composition layer with concurrent polymerization of said polymerizable compound; e. separating said cathode from said composition layer; and f. removing unpolymerized composition from said layer.
Claim 5
Dependent Claim
20 words
A method according to claim 1 wherein said imaging material composition includes an alkali metal salt of o-benzaldehyde sulfonic acid.
Claim 6
Dependent Claim
38 words
An imaging method according to claim 1 wherein said catode comprises a layer of a photoconductive compound and said image pattern of electrical conductivity is formed in said cathode by an image-wise light exposure of said photoconductive layer.
References Cited (Backward Citations)
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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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |