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:
Feb. 23, 2021
Filed:
Dec. 01, 2017
Applicant:
Metso Minerals Industries, Inc., Waukesha, WI (US);
Inventor:
Peter Henry Radziszewski, Baie D'Urfe, CA;
Assignee:
Metso Minerals Industries, Inc., Waukesha, WI (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B02C 17/16 (2006.01); B02C 19/22 (2006.01);
U.S. Cl.
CPC ...
B02C 19/22 (2013.01); B02C 17/163 (2013.01);
Abstract
A screw shaft for a vertically stirred grinding mill is arranged so as to be accommodated within a grinding chamber of the grinding mill while extending in a longitudinal direction. The screw shaft comprises a central shaft and at least one screw flight surrounding the central shaft, and the central shaft comprises an outer shaft wall defining a cavity within the interior of the central shaft, which cavity is closed at least at one longitudinal end of the central shaft.