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:
Nov. 28, 1995
Filed:
Jul. 06, 1994
Applicant:
Inventors:
Kin-ichi Yokoyama, Yonezawa, JP;
Izumi Kato, Yonezawa, JP;
Assignee:
Seiki Kabushiki Kaisha, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ; B29C / ;
U.S. Cl.
CPC ...
425144 ; 425548 ; 425549 ; 425564 ; 264 406 ; 2643289 ; 26432815 ;
Abstract
A method for runnerless injection molding of a synthetic resin, provided with a novel valve gate for performing intermittent temperature control to forcibly change the property of a molten or solidified resin material adjacent to the gate, capable of performing a precision molding operation without leaving an improper gate mark. The apparatus therefor comprises a runner 3 with a temperature maintaining means for storing a molten resin and forming an injection passage, a gate 1 in communication with a cavity 2 connected to the end of the runner 3, a valve pin 4 enclosed within the runner 3, and an intermittent temperature control assembly P.