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:
Jan. 02, 1996
Filed:
Feb. 06, 1995
Applicant:
Inventors:
Donald C Abbott, Norton, MA (US);
George A Dainis, III, Mansfield, MA (US);
David W West, Pembroke, MA (US);
Assignee:
Texas Instruments Incorporated, Dallas, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
C25F / ; C25F / ;
U.S. Cl.
CPC ...
20412935 ; 20412965 ; 20412975 ; 2042 / ; 204275 ;
Abstract
A method and apparatus for forming lead frames and eliminating irregularities in the edge (22) of openings etched in the sheet metal from which the lead frame is formed. In a first process, a photo resist coated metal sheet (36) is first etched by a photo chemical process to define the lead frame, and then the lead frame metal sheet (36) is etched in an electrochemical process to remove edge irregularities. In a second process, the entire lead frame is formed in an electrochemical process.