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:
Dec. 31, 1991
Filed:
Dec. 21, 1989
Carl R Graf, King of Prussia, PA (US);
Pennsylvania Crusher Corporation, Broomall, PA (US);
Abstract
A grinding mill having a rotatable grinding chamber within which is a body of elongate grinding members that have a longitudinal axis substantially longer than the maximum transverse dimension thereof. The mill is arranged in such a way as to retaining the grinding member axes substantially parallel to the grinding chamber rotational axis. The grinding members have a cross-sectional shape and a sufficient exterior surface smoothness for enabling a body of such members to tumble over and against one another in a rotating grinding chamber and to grind particulate material within the body, as well as a ratio of mass per unit of length which varies from one position to another along the length of the longitudinal axis.