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:
Mar. 23, 2004
Filed:
Dec. 05, 2002
Chris J. Rauwendaal, Los Altos Hills, CA (US);
Rauwendaal Extrusion Engineering, Inc., Los Altos Hills, CA (US);
Abstract
A mixing section ( ) for mixing material in an extruder ( ) having a barrel ( ), The mixing section ( ) includes a screw ( ) having a central shaft ( ), and a floating annular sleeve ( ) located between the screw ( ) and the barrel ( ), and surrounding a portion of the screw ( ). The sleeve ( ) has mixing elements ( ) protruding radially inward toward the screw ( ). A portion of the central shaft ( ) has mixing elements ( ) protruding radially outward toward the sleeve ( ). The mixing elements ( ) on the screw ( ) and the sleeve ( ) create multiple regions of reorientation ( ) in the material to be mixed which produce improved dispersive mixing.