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:
Oct. 05, 1993
Filed:
Sep. 03, 1992
Applicant:
Inventor:
John N Garner, Kingston, CA;
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
2641761 ; 264169 ; 26421121 ; 264323 ; 425197 ; 4253824 ;
Abstract
Extrusion apparatus and a method of extruding in which an extrusion screw terminates close to a breaker plate so that an annular passage surrounding the screw extends to the breaker plate. The breaker plate has flow apertures arranged around an edge region of the plate for direct communication with the annular passage. The flow passage arrangement decreases in cross-sectional area in a downstream direction whereby plastics materials do not become static in certain regions. Plastics degradation, particularly for PVC, is therefore avoided.