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:
Jul. 14, 1992
Filed:
Aug. 29, 1991
Applicant:
Inventor:
Thomas W Winstead, Baltimore, MD (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29B / ;
U.S. Cl.
CPC ...
366 79 ; 366 91 ; 366 97 ; 366287 ; 425207 ;
Abstract
A dynamic mixing system and method intensively mixes thermoplastic melt with other ingredients and entrains gas as a blowing agent in a thermoplastic melt so as to provide a foamed thermoplastic extrudate. The dynamic mixing system includes a plurality of mixing balls disposed circumferentially about the surface of a cylindrically shaped spindle which is rotatably disposed within a barrel, such that upon rotation of the spindle the mixing balls rotate in a planetary manner so as to intensively mix a flow of thermoplastic melt, for example, to entrain a blowing agent in the melt.