Patent US3909255A successfully refreshed from Google Patents.
US3909255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytically induced polymerization utilizing zinc and alkali metal sulfite
Assignee: Keuffel and Esser Co
•
Filing: 1973-12-03
•
Granted: 1975-09-30
•
Expires: 1993-12-03
Abstract
Abstract Material useful in electropolymerization processes comprises a conductive zinc-containing support and a layer thereon of a composition comprising a polymerizable monomer and an alkali metal sulfite. Electrolysis of the composition results in the formation of zinc sulfite with subsequent electrolytic generation of polymerization-inducing free radicals. The anodic reaction ensures polymerization at and bonding of the resulting polymer to the support sheet of the material even when used in conjunction with zinc oxide photoconductor cathode layers. The material is particularly useful in negative-working imagery and in the preparation of patterned resist layers.
Inventors
- 👤 Steven Levinos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:54
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A METHOD OF FORMING A POLYMERIC IMAGE OF A POLYMERIZABLE ETHYLENICALLY UNSATURATED COMPOUND WHICH COMPRISES: A. COMBINING SAID COMPOUND IN A COMPOSITION COMPRISING AN ALKALI METAL SULFIDE, B. DISPOSING SAID COMPOSITION AS A LAYER UPON AN ELECTRICALLY CONDUCTIVE BODY COMPRISING METALLIC ZINC, AND C. IN AN ELECTROLYTIC CIRCUIT WHEREIN SAID CONDUCTIVE BODY COMPRISES THE ANODE, SUBJECTING SAID COMPOSITION LAYER TO THE PASSAGE OF AN ELECTRICAL CURRENT IN ACCORDANCE WITH A PATTERN CORRESPONDING TO THE IMAGE TO BE FORMED.
Claim 2
Independent Claim
78 words
A METHOD OF FORMING A POLYMERIC IMAGE OF A POLYMERIZABLE ETHYLENICALLY UNSATURATED COMPOUND WHICH COMPRISES: A. COMBINING SAID COMPOUND IN A COMPOSITION COMPRISING AN ALKALI METAL SULFIDE, B. DISPOSING SAID COMPOSITION AS A LAYER UPON AN ELECTRICALLY CONDUCTIVE BODY COMPRISING METALLIC ZINC, AND C. IN AN ELECTROLYTIC CIRCUIT WHEREIN SAID CONDUCTIVE BODY COMPRISES THE ANODE, SUBJECTING SAID COMPOSITION LAYER TO THE PASSAGE OF AN ELECTRICAL CURRENT IN ACCORDANCE WITH A PATTERN CORRESPONDING TO THE IMAGE TO BE FORMED.
Claim 3
Dependent Claim
50 words
A method according to claim 1 wherein said anode is substantially uniformly electrically conductive over the whole of its surface and the cathode of said circuit is in substantial electrically conductive contact with a preselected portion only of the exposed surface of said layer, said portion constituting said image pattern.
Claim 4
Dependent Claim
107 words
an alkali metal sulfite; b. contacting the exposed surface of said layer with a cathode exhibiting a pattern of electrical conductivity corresponding to the image to be formed; 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 the image pattern of conductivity of said cathode, thereby effecting imagewise 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
107 words
an alkali metal sulfite; b. contacting the exposed surface of said layer with a cathode exhibiting a pattern of electrical conductivity corresponding to the image to be formed; 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 the image pattern of conductivity of said cathode, thereby effecting imagewise 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 6
Independent Claim
31 words
A method of forming an image which comprises: a. providing imaging material comprising an electrically conductive support comprising metallic zinc having a coating thereon of a layer of polymerizable composition comprising:
Claim 7
Independent Claim
31 words
A method of forming an image which comprises: a. providing imaging material comprising an electrically conductive support comprising metallic zinc having a coating thereon of a layer of polymerizable composition comprising:
Claim 8
Dependent Claim
38 words
An imaging method according to claim 3 wherein said cathode comprises a layer of a photoconductor compound and said image pattern of electrical conductivity is formed in said cathode by an imagewise light exposure of said photoconductor layer.
References Cited (Backward Citations)
US3236644A
Cited
US3285837A
Cited
US3436215A
Cited
US3697275A
Cited
US3600173A
Cited
US3464960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |