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. 07, 1976
Filed:
Dec. 24, 1974
Applicant:
Inventors:
Hussain El-Ghatta, Chur, Grisons, CH;
Johann Karl Forrer, Domat-Ems, Grisons, CH;
Assignee:
Inventa AG fur Forschung und Patentverwertung, Zurich, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ;
U.S. Cl.
CPC ...
252436 ; 252438 ; 252439 ; 252447 ; 423387 ;
Abstract
Novel platinum catalysts and a method for their preparation are disclosed. They are prepared by treating catalysts of platinum metal with salts of sulfurous acid or with sulfur compounds which liberate sulfurous acid in the presence of an acid. The treatment is conducted in the presence of hydroxylammonium salts in acid medium and in the absence of oxidizing agents capable of oxidizing sulfurous acid to form sulfate. The resulting catalysts are useful in preparing hydroxylamine.