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:
May. 20, 1980
Filed:
Aug. 21, 1978
Heinrich Wagener, Bochum, DE;
Karl-Heinrich van Heek, Essen, DE;
Bergwerksverband GmbH, Essen, DE;
Abstract
A method and an apparatus are disclosed for classifying particulate substances. A mix of heavier and lighter particles is confined between upwardly divergent side walls and a fluidizing gas is blown into the mix from below. A conveying conduit is arranged below the sidewalls and has vertical conduit portions which have upper open ends communicating with the space between the sidewalls. A classifying gas is blown through the conduit and the conduit portions at a pressure which is higher than that of the fluidizing gas to keep the lighter particles from entering the upper open ends, but which is sufficiently low so that the heavier particles can overcome the pressure of the classifying gas and drop through the upper open ends into the conveying conduit from which they are periodically expelled by bursts of a transporting gas.