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. 18, 2001
Filed:
Jan. 24, 1996
Applicant:
Inventor:
Ragnar Wold, Porsgrunn, NO;
Assignee:
Norsk Hydro A/S, Oslo, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B 7/07 ;
U.S. Cl.
CPC ...
C01B 7/07 ;
Abstract
A method of removing iron and halogen coloring materials from hydrochloric acid, by removing iron from the hydrochloric acid, and thereafter adding a nitrogen containing reducing agent to the hydrochloric acid.