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:
Jan. 07, 1992
Filed:
Apr. 30, 1990
Applicant:
Inventors:
Earl P Horwitz, Argonne, IL (US);
Renato Chiarizia, Argonne, IL (US);
Assignee:
Arch Development Corporation, Chicago, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23F / ; C23F / ; C02F / ; C01B / ;
U.S. Cl.
CPC ...
252 81 ; 252 82 ; 252 84 ; 252 85 ; 252 86 ; 252 87 ; 252180 ; 252181 ; 2521881 ; 2521882 ; 25218822 ; 25218825 ;
Abstract
A mixture of a di- or polyphosphonic acid and a reductant wherein each is present in a sufficient amount to provide a synergistic effect with respect to the dissolution of metal oxides and optionally containing corrosion inhibitors and pH adjusting agents.