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:
Oct. 21, 2003
Filed:
Oct. 26, 1998
Gijsbert W. Lokhorst, Enter, NL;
Robert M. Fritzsche, Attleboro Falls, MA (US);
Ronald B. Wheelock, Attleboro, MA (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A method of fabricating a lead frame. The method includes providing an electrically conductive layer having a pair of opposing major surfaces. A pattern is etched in the layer extending partially through the layer to form cavities with sidewalls in the layer. A patterned mask is provided on the etched layer including masking of the sidewalls. The layer is again etched within the cavities. The patterned mask is preferably a liquid photo resist and the electrically conductive layer is preferably one of a copper or copper-based material or ALLOY 42. The etch can take place from both major surfaces.