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:
Nov. 21, 1978
Filed:
Feb. 14, 1977
Arthur G Clem, Des Plaines, IL (US);
American Colloid Company, Skokie, IL (US);
Abstract
A method and apparatus for use in separating oversize from on size particles in a mass of particulate materials passed rapidly through a screening device includes a sloping screen mesh having sizing openings dimensioned to be larger than the desired maximum on size particles intended to pass through the mesh. The screen mesh is supported at a relatively steep slope angle and the cosine of the angle of the slope multiplied times the mesh opening size is set up to be substantially equal to the desired maximum on size particles to be passed through the screen mesh. A particle rebound shield is spaced closely above the upper surface of the screen mesh for reflecting and directing particles that bounce off the screen mesh back towards the openings therein. The material flow rapidly over the mesh because of the steep slope angle and the rebound shield insures that on size particles are directed toward the openings in the mesh a sufficient number of times during their travel through the apparatus to pass through the mesh.