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:
Jan. 21, 1992
Filed:
Mar. 12, 1990
J Gary Welch, Baltimore, MD (US);
Robert E Ellingham, Baltimore, MD (US);
CRI International, Inc., Baltimore, MD (US);
Abstract
A mixture of shaped catalysts, catalyst supports or sorbents comprising generally cylindrical, free flowing particles of regular geometric shape having substantially the same diameter and of varying length are length graded into a first group of particles having a length below a predetermined length, L.sub.1, in the range of fromn 0.8 to about 24 millimeters and an L/D greater than one, and a second group of particles having a length greater than L.sub.1, by feeding the mixture into a rotating cylindrical drum having inwardly opening indentations in its cylindrical wall having a transverse diameter of substantially L.sub.1. The drum is rotated about its longitudinal axis at speeds sufficient to entrap in the indentations and convey particles having a length below L.sub.1 comprising the first group upwardly to a height permitting the particles to fall into a fixed, upwardly opening trough, while retaining the second group of particles having a length above L.sub.1 in a bottom portion of the drum for separate recovery of the two groups of particles.