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. 22, 1977
Filed:
Jul. 28, 1975
Applicant:
Inventor:
Henry Ellwood, Rochdale, EN;
Assignee:
USM Corporation, Boston, MA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29F / ;
U.S. Cl.
CPC ...
222413 ; 222564 ; 425311 ;
Abstract
An extruder having a screw rotatable in a chamber provided with an annularly perforated end wall through which plastic material is extruded, the end of the screw being provided with a collar urged against the central portion of the wall to exclude the material therebetween.