Patents by Inventor Taro Sasabe

Taro Sasabe has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for producing a concentrated solution for a photoresist-stripping liquid having low water content
    Patent number: 8299303
    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.
    Type: Grant
    Filed: August 27, 2009
    Date of Patent: October 30, 2012
    Assignee: KNC Laboratories Co., Ltd.
    Inventors: Katsutoshi Hirose, Hiroya Koyama, Kimihiro Kamasaka, Taro Sasabe, Naoshi Kai
  • PROCESS FOR PRODUCING A CONCENTRATED SOLUTION FOR A PHOTORESIST-STRIPPING LIQUID HAVING LOW WATER CONTENT
    Publication number: 20100298605
    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.
    Type: Application
    Filed: August 27, 2009
    Publication date: November 25, 2010
    Inventors: Katsutoshi Hirose, Hiroya Koyama, Kimihiro Kamasaka, Taro Sasabe, Naoshi Kai