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:
Oct. 25, 2005
Filed:
Nov. 21, 2003
Applicants:
Thomas A. Gates, Parma, MI (US);
James N. Valentine, Rives Junction, MI (US);
David H. Steele, Jackson, MI (US);
Steven H. Bowens, West Chester, PA (US);
Inventors:
Thomas A. Gates, Parma, MI (US);
James N. Valentine, Rives Junction, MI (US);
David H. Steele, Jackson, MI (US);
Steven H. Bowens, West Chester, PA (US);
Assignee:
CertainTeed Corporation, Valley Forge, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C047/64 ;
U.S. Cl.
CPC ...
Abstract
The present invention includes a screw tip for an extruder screw for effecting mixing in an extruder. The screw tip has a substantially conical outside surface and at least one discontinuous fin. The at least one fin protrudes from the outside surface of the screw tip.