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:
Mar. 19, 2013
Filed:
Jun. 07, 2011
Shigeki Tanaka, Nanae, JP;
Atsushi Fujisawa, Nanae, JP;
Masahiro Tani, Nanae, JP;
Satoru Suzuki, Nanae, JP;
Shigeki Tanaka, Nanae, JP;
Atsushi Fujisawa, Nanae, JP;
Masahiro Tani, Nanae, JP;
Satoru Suzuki, Nanae, JP;
Renesas Electronics Corporation, Kawasaki-shi, JP;
Abstract
The occurrence of a resin seal failure is suppressed. A molding step is carried out using a lead frame in which there are formed multiple air vent portions for discharging gas in each cavity formed in the upper die of a molding die to outside the cavity. The air vent portions are formed at positions overlapping with the other corner portions, arranged inside a gate portion of the cavity. Each of the air vent portions is led out from the other corner portions of the cavity to outside a clamp area and is extended along sides of the cavity, respectively, in the clamp area.