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:
Jun. 28, 1977
Filed:
Oct. 03, 1975
John P Ross, Cupertino, CA (US);
Carl E Bernardi, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A method and apparatus for selectively plating the die-attach area of a semiconductor chip header are described. The apparatus comprises a rotary disc assembly. In the assembly there is provided a plurality of cavities for removably receiving individual headers. In each cavity there is provided an annular masking member for masking a header situated therein. Associated with each cavity, there is provided a cam-operated clamping means for clamping a header against the masking member and for coupling a source of potential to the header. Also associated with each cavity is a fluid jet for jetting a plating fluid against the header through a hole in the center of the sealing member. Plating fluid is selectively pumped, by means of a pumping means, to each of the jets along a plurality of fluid passageways from a fluid manifold. The fluid manifold is adapted to couple a predetermined number of the fluid passageways and jets to the pumping means as the disc assembly is rotated. Means are also provided for automatically releasing the clamping means and removing each header from the apparatus after completion of the plating operation.