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US4401520A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the preparation of screen printing stencils by an electroplating method

Assignee: Hoechst AG
•
Filing: 1981-03-18
•
Granted: 1983-08-30
•
Expires: 2001-03-18
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Abstract

Abstract This invention relates to an improvement in the process for the preparation of screen printing stencils by an electroplating method, which comprises coating a metallic matrix, provided in the manner of a screen with dots of insulating material, with a photoresist layer, exposing the photoresist layer imagewise and developing it by washing out, and rendering those areas of the photoresist layer which have remained in place electrically conductive in the course of imaging, electrodepositing metal up to a desired height on the conductive image stencil and on the matrix ridges surrounding the insulating screen dots, and removing the patterned screen printing stencil thus obtained from the matrix, the improvement which comprises rendering the photoresist layer conductive only on its surface and before developing.

Inventors

  • 👤 Hartmut Steppan
  • 👤 Barbara Wildenhain
  • 👤 Hans Ruckert

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 14:22
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/12

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 91 words
A process for the preparation of screen printing stencils which comprises coating a metallic matrix, provided in screen-like arrangement with dots of insulating material, with a photoresist layer, exposing the photoresist layer imagewise, thereafter rendering the surface of the photoresist layer electrically conductive by the application of conductive particles, subsequently developing the photoresist layer by washing out, electrodepositing metal up to a desired height on the conductive image stencil and on the matrix ridges surrounding the insulating screen dots, and removing the patterned screen printing stencil thus obtained from the matrix.
Claim 2
Dependent Claim 91 words
A process for the preparation of screen printing stencils which comprises coating a metallic matrix, provided in screen-like arrangement with dots of insulating material, with a photoresist layer, exposing the photoresist layer imagewise, thereafter rendering the surface of the photoresist layer electrically conductive by the application of conductive particles, subsequently developing the photoresist layer by washing out, electrodepositing metal up to a desired height on the conductive image stencil and on the matrix ridges surrounding the insulating screen dots, and removing the patterned screen printing stencil thus obtained from the matrix.
Claim 3
Dependent Claim 15 words
A process as claimed in claim 1, including using graphite powder as the conductive particles.
Claim 4
Dependent Claim 17 words
A process as claimed in claim 1, including using a photoresist layer which becomes soluble by exposure.
Claim 5
Dependent Claim 12 words
A process as claimed in claim 1, including using a cylindrical matrix.
Claim 6
Dependent Claim 32 words
A process as claimed in claim 1, in which the matrix used has depressions or perforations which are arranged in the form of a screen and are filled with a non-conductive material.
Claim 7
Dependent Claim 27 words
A process as claimed in claim 1, in which the matrix used has a flat surface on which screen dots of a non-conductive material have been placed.
Claim 8
Dependent Claim 17 words
A process as claimed in claim 1, including producing the screen printing stencil by electrodeposition of nickel.

References Cited (Backward Citations)

US2287122A Cited
US3586609A Cited
US3586610A Cited
DE2259182A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-08-29 1987-02-28 1987-08-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-08-29 1991-02-28 1991-08-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-08-29 1995-02-28 1995-08-30 $7700.00 Window Closed / Lapsed

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