US4350748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic process for the manufacture of printing forms or printed circuits including transfer of photoconductive coating from temporary support
Assignee: Hoechst AG
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Filing: 1981-06-29
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Granted: 1982-09-21
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Expires: 2001-06-29
Abstract
Abstract This invention relates to an improvement in the process for the manufacture of printing forms and printed circuits by coating an electrically conductive support with an organic photoconductor layer and by charging, exposing, and developing the electrostatic image by means of a finely particulate toner, fixing and dissolving the layer away from the non-image areas by means of a decoating medium and, if appropriate, etching of the bared support surface, the improvement which comprises, for the purpose of coating, transferring the organic photoconductor layer on a temporary support to the electrically conductive support with the aid of heat and pressure.
Inventors
- 👤 Erwin Lind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:43
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/061; H05K3/065; G; G03; G03G; G03G13/00; G03G13/26; G03G13/32; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0525; H05K2203/00; H05K2203/05; H05K2203/0502; H05K2203/0517; H05K2203/06; H05K2203/066
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
In the process for the manufacture of printing forms and printed circuits by coating an electrically conductive support with an organic photoconductor layer and by charging, exposing, and developing the electrostatic image by means of a finely particulate toner, fixing and dissolving the layer away from the non-image areas by means of a decoating medium and, if appropriate, etching of the bared support surface; the improvement which comprises, for the purpose of coating, transferring the organic photoconductor layer on a temporary support to the electrically conductive support with the aid of heat and pressure.
Claim 2
Dependent Claim
94 words
In the process for the manufacture of printing forms and printed circuits by coating an electrically conductive support with an organic photoconductor layer and by charging, exposing, and developing the electrostatic image by means of a finely particulate toner, fixing and dissolving the layer away from the non-image areas by means of a decoating medium and, if appropriate, etching of the bared support surface; the improvement which comprises, for the purpose of coating, transferring the organic photoconductor layer on a temporary support to the electrically conductive support with the aid of heat and pressure.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1 wherein the temporary support used is a plastic film.
Claim 4
Dependent Claim
16 words
A process as claimed in claim 2 wherein the plastic film used is a polyester film.
Claim 5
Dependent Claim
25 words
A process as claimed in claim 1 wherein the organic photoconductor layer is transferred at transfer temperatures in the range of 100° to 180° C.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 1 wherein the organic photoconductor layer is transferred under a pressure of 2 to 10 bars.
Claim 7
Dependent Claim
19 words
A process as claimed in claim 1 wherein the electrically conductive support is a metal plate or metal foil.
Claim 8
Dependent Claim
17 words
A process as claimed in claim 6 wherein the electrically conductive support is a copper-laminated plastic plate.
Claim 9
Dependent Claim
21 words
A process as claimed in claim 6 wherein the electrically conductive support is an aluminum foil with a mechanically roughened surface.
Claim 10
Dependent Claim
30 words
A process as claimed in claim 6 wherein the electrically conductive support is an aluminum plate which has been electrochemically roughened, anodized and pretreated with polyvinylphosphonic acid or with silicate.
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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |