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:
Apr. 27, 2010
Filed:
Sep. 22, 2004
Seiichiro Endo, Kobe, JP;
Masatoshi Yokota, Kobe, JP;
Yoshiyuki Nakai, Kobe, JP;
Hiroaki Tanaka, Kobe, JP;
Seiichiro Endo, Kobe, JP;
Masatoshi Yokota, Kobe, JP;
Yoshiyuki Nakai, Kobe, JP;
Hiroaki Tanaka, Kobe, JP;
SRI Sports Limited, Kobe, JP;
Abstract
A mold comprises a spherical cavity, a support pin capable of being moved forward and backward with respect to the cavity, and a vent pin (). The vent pin () includes two slits (S), an annular groove () and a vertical groove (). An upper end () of the slit (S) is opened toward the cavity. A lower end () of the slit (S) is opened toward the annular groove (). The annular groove () is coupled to the vertical groove (). The lower end of the vertical groove () is opened toward air. A width (W) of the slit (S) is preferably equal to or greater than 1 μm, is more preferably equal to or greater than 3 μm, and is particularly preferably equal to or greater than 5 μm. A depth (D) of the slit (S) is preferably equal to or greater than 10% of a diameter (φ), is more preferably equal to or greater than 15% of the diameter (φ), and is particularly preferably equal to or greater than 20% of the diameter (φ). It is preferable that the same slit () should be formed on the support pin.