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. 13, 1976
Filed:
Jul. 05, 1974
Applicant:
Inventors:
Thomas G Bishop, Mount Gilead, OH (US);
William T Flickinger, Marion, OH (US);
Assignee:
Koehring Company, Milwaukee, WI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29B / ;
U.S. Cl.
CPC ...
259191 ; 259 10 ; 425208 ;
Abstract
A screw for injection molding of synthetic resinous material having a tendency to abrade and score the injection molding apparatus is provided along a substantial length of the feed section with a substantially undercut screw flight. An average particle of synthetic resinous feed stock material may pass between the undercut screw flights and a cooperating barrel without squashing. The undercut screw flights are effective to provide a controlled feed pressure for the particulate material entering the downstream portion of the screw.