The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 24, 1981
Filed:
May. 06, 1980
Kunio Ikeda, Tokyo, JP;
Ricoh Co., Ltd., Tokyo, JP;
Abstract
A method of forming a plate having a plurality of uniform and precisely sized fine bores. The method comprises winding around a mold member a wire having a diameter equal to that of the fine bores to be formed, forming an electro-cast layer on the mold member, superposing and uniting another mold member to the first-mentioned mold member, removing only the wire to a predetermined depth to form a mold, forming a plurality of plastic sheets using this mold, effecting a treatment for obtaining a conductivity on each plastic sheet to form an electro-cast master, forming an electro-cast film using this electro-cast master and separating the electro-cast layer thereby to form the plates having fine bores dispersed and sized uniformly and finished at high circularity and cylindricalness.