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:
Sep. 17, 1991
Filed:
Sep. 26, 1989
Applicant:
Inventors:
Nobuyasu Hasebe, Palos Verdes, CA (US);
Jackson Yu, Irvine, CA (US);
Assignee:
Ultraclean Incorporated, Irvine, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ; C01B / ;
U.S. Cl.
CPC ...
4235 / ; 2329 / ; 4235762 ;
Abstract
A cake containing sulfur and other materials in a base solvent, such as that resulting from a liquid redox hydrogen sulfide removal process, is purified to obtain elemental sulfur by preferential solubilization of the sulfur, employing a selected solvent immiscible with the base solvent at an elevated temperature less than that required to produce a phase change. The base and selected solvents are then separated, and the temperature of the sulfur solvent is lowered to recrystalize elemental sulfur.