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. 19, 1988
Filed:
Aug. 07, 1986
Applicant:
Inventors:
J Gary Welch, Baltimore, MD (US);
Robert E Ellingham, Baltimore, MD (US);
Assignee:
CRI International, Inc., Baltimore, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; C10G / ; B03B / ; B07B / ;
U.S. Cl.
CPC ...
502 21 ; 2082 / ; 209 443 ; 209467 ; 209687 ; 502 27 ; 502 38 ; 502516 ;
Abstract
A spent hydrotreating catalyst having carbonaceous and metallic deposits comprising generally cylindrical, free flowing particles of regular geometric shape having substantially the same diameter but of varying length is stripped, length graded, density graded using an upward flow of gas through an inclined, vibrating surface, and regenerated to achieve catalyst activity very near that of a fresh catalyst.