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. 13, 1976
Filed:
Dec. 16, 1974
Applicant:
Inventors:
Kunio Hirota, Hitachi, JA;
Yoshinori Takata, Tokai, JA;
Yoshijiro Arikawa, Hitachi, JA;
Kazuo Tanno, Hitachi, JA;
Yoshiaki Okajima, Hitachi, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; C23F / ;
U.S. Cl.
CPC ...
203-7 ; 203 11 ; 203D / ; 159D / ; 210 46 ; 210 58 ; 252180 ; 252181 ;
Abstract
A method of preventing scale from being deposited in case of producing fresh water from sea water by heating the sea water in a vapour pressure type evaporator and multiple stage flush evaporator and by condensing water vapour evolved to obtain the fresh water comprising adding to the sea water small amount of seed crystal selected from the group consisting of calcium carbonate and magnesium hydroxide together with a surface active agent selected from the group consisting of a nonionic active agent and cation surface active agent.