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. 15, 1978
Filed:
Mar. 18, 1977
Applicant:
Inventor:
Herbert Ocker, Leonberg, DE;
Assignee:
Werner & Pfleiderer, Stuttgart, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29B / ;
U.S. Cl.
CPC ...
366 75 ; 159 / ; 264102 ; 366 84 ;
Abstract
A screw extruder for continuously processing and degasing elastomers and polymers having a viscosity of more than 1,000 poise comprising a casing with an input zone at one end and a discharge zone at the other, several degasing zones within the casing along the length thereof and a pressure zone upstream of each degasing zone. The inside wall portions juxtaposed to the degasing zones include spiral grooves having at the most the same depth as the flights of the extruder screws.