Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making named article
Patent
1989-04-11
1991-05-21
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making named article
430323, 430394, 3034651, G03C 500
Patent
active
050174606
ABSTRACT:
The invention relates to a method of manufacturing a shear plate for a dry-shaver, which shear plate is formed with perforations, at least one side of a metal sheet being provided with a layer of a photosensitive material, which photosensitive material is exposed to radiation via a mask formed with a pattern of holes corresponding to the pattern of the perforations, after which the photosensitive material is developed and the perforations are formed in the metal sheet by etching. In accordance with the method a positive photosensitive material is used and in at least two stages at least two masks are employed, the method as defined above being carried out using a first mask and, subsequently, in the second stage using a second mask that part of the positive photosensitive material which was covered by the first mask being exposed to radiation, upon which said material is developed and the etching process is continued.
REFERENCES:
patent: 3179543 (1965-04-01), Marcelis
Bartlett Ernestine C.
Bowers Jr. Charles L.
Chea Thorl
U.S. Philips Corp.
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