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:
Oct. 30, 2012
Filed:
Aug. 27, 2009
Katsutoshi Hirose, Hyogo, JP;
Hiroya Koyama, Hyogo, JP;
Kimihiro Kamasaka, Hyogo, JP;
Taro Sasabe, Hyogo, JP;
Naoshi Kai, Hyogo, JP;
Katsutoshi Hirose, Hyogo, JP;
Hiroya Koyama, Hyogo, JP;
Kimihiro Kamasaka, Hyogo, JP;
Taro Sasabe, Hyogo, JP;
Naoshi Kai, Hyogo, JP;
KNC Laboratories Co., Ltd., Hyogo, JP;
Abstract
There is provided a process for producing a concentrated solution of quaternary ammonium hydroxide which is characterized in that quaternary ammonium hydroxide in a form of water-containing crystals or of an aqueous solution is mixed with a water-soluble organic solvent selected from the group consisting of glycol ether, glycol and triol and the resulting mixed solution is subjected to a thin-film distillation in vacuo so as to evaporate the low boiling material. In accordance with this process, a concentrated solution of quaternary ammonium hydroxide having low water content is able to be easily produced.