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. 21, 2004
Filed:
Feb. 10, 2003
Kiyoharu Hamasaki, Nara, JP;
Hironobu Hirasawa, Inazawa-shi, Aichi, JP;
Noboru Yamada, Yawata-shi, Kyoto, JP;
Other;
Abstract
Calcium nitrate, which is known to have the effect of inhibiting elution of phosphorus contained as insoluble substance in sludge in rivers, lakes and coasts in a reducing environment, can be applied not by injection of an aqueous solution of calcium nitrate, but by putting it in a solid form. An agent for inhibiting elution of phosphorus is proposed which comprises calcium nitrate as the major component (10-30%), calcium carbonate or calcium sulfate (a total of 50-90%), and stearic acid or its salt (1-20%) as a hydrophobic substance for delaying elution of the calcium salt, and sucrose fatty acid isobutyl or paraoxy isobutyl benzoate (1-20%) as a binder, and the composition is pressed in a mold into tablets or briquette. The application into sludge by use of an air gun is preferable.