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:
Dec. 08, 1992
Filed:
Dec. 04, 1991
Applicant:
Inventors:
Danny Y Ngan, Houston, TX (US);
Randy C John, Houston, TX (US);
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C11G / ;
U.S. Cl.
CPC ...
208 / ; 148286 ; 148280 ;
Abstract
A process for heat treatment of high temperature steels in which the steels are heated to temperatures of at least 1800.degree. F. in the presence of hydrogen gas, methane, hydrogen sulfide, and steam. Articles made by the process have a unique layer enriched in chromium oxide, and reactor components made from the treated steel may be used in a process for the pyrolysis of liquid and gaseous hydrocarbons to inhibit coking.