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. 07, 1990
Filed:
Apr. 06, 1989
Applicant:
Inventor:
Hiroshi Kumazaki, Numazu, JP;
Assignee:
Toshiba Kikai Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
425135 ; 425153 ; 425203 ; 425587 ; 425812 ;
Abstract
In a vent type injection molding machine having a screw contained in a heating cylinder, there are provided a plurality axially spaced apart vent openings located at intermediate points of the heating cylinder for venting inside of the heating cylinder to the outside and control means for selectively opening and closing the vent openings in accordance with the position of the screw in the heating cylinder or the pressure of a thermoplastic resin injected by the injection molding machine.