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:
Jun. 19, 2012
Filed:
Oct. 25, 2007
Shigeru Sakurai, Chiyoda-ku, JP;
Masaharu Emoto, Chiyoda-ku, JP;
Shigeru Sakurai, Chiyoda-ku, JP;
Masaharu Emoto, Chiyoda-ku, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
To provide a method for removing an acidic deposit containing a sulfur compound, whereby the terminal point of the cleaning state can be ascertained simply and efficiently without necessity to visually directly observe the cleaning state or to observe the behavior of the pH value of the cleaning fluid. A method for removing an acidic deposit containing a sulfur compound, which comprises contacting the acidic deposit with a prescribed amount of an aqueous cleaning fluid, characterized in that the concentration of sulfate ion (SO) in the aqueous cleaning fluid is measured, and the contact with the aqueous cleaning fluid is terminated after the increase per hour of the measured value becomes 15 not more than 10%.