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:
Apr. 02, 1991
Filed:
Nov. 20, 1989
Toru Makino, Shizuoka, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A process of shaping a thin metal film into a lead frame starts with preparing a thin metal film, an etchant effective against the thin metal film and a photoresist solution resistive to the etchant, followed by coating the entire surface of the thin metal film with the photoresist solution so as to form a multiple level structure having the thin metal film and a photoresist film, and a predetermined pattern is embossed on the multiple level structure so as to break slits in the photoresist film along the periphery of the predetermined pattern, then removing a part of the multiple level structure by using the etchant so that a hollow space is formed therein in the predetermined pattern.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile