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:
Sep. 05, 1995
Filed:
Jan. 21, 1994
Applicant:
Inventors:
Assignee:
Nokia-Maillefer SA, Ecublens/VD, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25B / ; B29C / ; B29C / ;
U.S. Cl.
CPC ...
165-2 ; 165 30 ; 165 64 ; 165183 ; 425144 ; 4253781 ; 4253791 ; 219201 ; 219531 ; 219535 ; 219539 ; 219544 ;
Abstract
A longitudinal stream of cooling air is caused to flow around the cylinder (10) and over the length of each of one or more heating-and-cooling zones. This longitudinal flow is facilitated by specially designed cooling fins (22; 25). The performance of the extruder is improved in that the temperature over the cross-section of the cylinder is more uniform. Moreover, wear and tear on the extrusion screw and on the cylinder are greatly reduced.