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:
Apr. 28, 1981
Filed:
Dec. 15, 1978
Applicant:
Inventors:
Assignee:
Nissan Chemical Industries Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; C11D / ; C11D / ;
U.S. Cl.
CPC ...
252 87 ; 134 42 ; 252 80 ; 252 82 ;
Abstract
A scale containing calcium oxalate as a main component which is adhered on an inner wall of an apparatus is easily removed by contacting it with an aqueous solution containing (1) aluminum ions and/or ferric ions and (2) anions of acid.