Patents by Inventor Masako Saijo

Masako Saijo 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 preparing triazine compound and quaternary ammonium salts
    Patent number: 6673922
    Abstract: A high yield process for preparing 4,6-dialkoxy-1,3,5-triazine-2-halide by reacting a cyanuric halide with an alcohol compound such as methanol in the presence of an alkali such as sodium hydrogencarbonate, wherein the water content present in the reaction system at the beginning of the reaction is controlled to not more than 0.5 mol based on 1 mol of the cyanuric halide or the water content present in the reaction system during the period of the reaction is controlled to not more than 2.5 mol based on 1 mol of the cyanuric halide.
    Type: Grant
    Filed: March 8, 2002
    Date of Patent: January 6, 2004
    Assignee: Tokuyama Corporation
    Inventors: Masako Saijo, Naoki Hirano
  • Protection of di-t-butyl dicarbonate against decomposition
    Patent number: 6555713
    Abstract: The decomposition of di-t-butyl dicarbonate which is a thermally unstable compound is inhibited. To achieve the object, a hydrocarbon compound such as hexane, cyclohexane, 1-hexene or toluene and/or a chain ether compound such as diisopropyl ether or t-butyl methyl ether are/is used as a decomposition inhibitor for di-t-butyl dicarbonate.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: April 29, 2003
    Assignee: Tokuyama Corporation
    Inventors: Naoki Hirano, Masako Saijo
  • Processes for preparing triazine compounds and quaternary ammonium salts
    Publication number: 20020123628
    Abstract: In the process of the invention to prepare 4,6-dialkoxy-1,3,5-triazine-2-halide by reacting a cyanuric halide with an alcohol compound such as methanol in the presence of an alkali such as sodium hydrogencarbonate, the water content present in the reaction system at the beginning of the reaction is controlled to not more than 0.5 mol based on 1 mol of the cyanuric halide or the water content present in the reaction system during the period of the reaction is controlled to not more than 2.5 mol based on 1 mol of the cyanuric halide. According to the invention, 4,6-dialkoxy-1,3,5-triazine-2-halide can be prepared in a high yield.
    Type: Application
    Filed: March 8, 2002
    Publication date: September 5, 2002
    Inventors: Masako Saijo, Naoki Hirano