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:
Feb. 10, 1981
Filed:
Sep. 12, 1979
Applicant:
Inventor:
Roland O Dhondt, Long Beach, CA (US);
Assignee:
Union Oil Company of California, Brea, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B65G / ; C10B / ; C10B / ;
U.S. Cl.
CPC ...
414786 ; 48 8 / ; 4819 / ; 48210 ; 201 41 ; 202262 ; 414187 ; 414198 ;
Abstract
A method for introducing particulate solids upwardly through a bottom solids inlet of a solids upflow vessel wherein after full extension of a piston to displace solids from a feed cylinder into the solids upflow vessel, the piston is partially retracted to 'relax' the bed of solids in the solids upflow vessel. The bed relaxation step reduces the piston-to-solids pressure during the pumping stroke as well as substantially reducing the solids loading pressure on the device used to prevent backflow of solids from the upflow vessel during refilling of the feed cylinder.