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:
Aug. 22, 2000
Filed:
Sep. 24, 1998
Applicant:
Inventors:
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
425116 ; 26427217 ; 4251291 ; 425544 ;
Abstract
A transfer molding apparatus with a specially designed cull-block can prevent the occurrence of defective molding caused by the air trapped inside the mold body. This cull-block has a cylindrical protrusion at the center of the cull-block and a circular sunken part along the perimeter of the protrusion. This new design prevents the air remaining behind the front of the fluid molding compound during molding process and finally, promotes the production of semiconductor device package free from molding defects.