Patents by Inventor Nobuyoshi Iwashita

Nobuyoshi Iwashita 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).

  • Azeotropic mixture of hydrogen fluoride and 1,1,1-trifluoro-2-chloroethane
    Patent number: 5401430
    Abstract: Hydrogen fluoride and 1,1,1-trifluoro-2-chloroethane forms an azeotropic mixture of which molar ratio of HF/1,1,1-trifluoro-2-chloroethane varies, for example, from about 60/40 at a pressure of 1.5 Kg/cm.sup.2 G and a temperature of 20.degree. C. to about 45/55 at a pressure of 15 Kg/cm.sup.2 G and a temperature of 87.degree.C.
    Type: Grant
    Filed: October 18, 1993
    Date of Patent: March 28, 1995
    Assignee: Daikin Industries, Ltd.
    Inventors: Takehide Tsuda, Nobuyoshi Iwashita, Satoshi Komatsu, Satoshi Koyama
  • Azeotropic mixture of hydrogen fluoride and 1,1,1-trifluoro-2-chloroethane and process for purification of 1,1,1-trifluoro-2-chloroethane
    Patent number: 5324873
    Abstract: Hydrogen fluoride and 1,1,1-trifluoro-2-chloroethane forms an azeotropic mixture. A mixture comprising hydrogen fluoride and 1,1,1-trifluoro-2-chloroethane is phase separated when it is cooled to a temperature below 7.degree. C. 1,1,1-Trifluoro-2-chloroethane is purified effectively from the mixture by cooling the mixture to form an upper liquid phase and a lower liquid phase and distilling the lower liquid phase so that the hydrogen fluoride is removed as an azeotropic distillate and 1,1,1-trifluoro-2-chloroethane substantially free from hydrogen fluoride is obtained as a bottom product.
    Type: Grant
    Filed: February 12, 1993
    Date of Patent: June 28, 1994
    Assignee: Daikin Industries Limited
    Inventors: Takehide Tsuda, Nobuyoshi Iwashita, Satoshi Komatsu, Satoshi Koyama
  • Triperfluoroalkylamines and preparation of the same
    Patent number: 5075508
    Abstract: Triperfluoroalkylamines of the formula: ##STR1## wherein, Rf.sup.1 and Rf.sup.2 are each a perfluoroalkyl group having 1 to 4 carbon atoms, and Rf.sup.3 is a perfluoroalkyl group having 3 to 11 carbon atoms, have good thermal stability, good voltage resistance, good fluidity at low temperature and low surface energy and which produce no toxic perfluoroisobutene.
    Type: Grant
    Filed: July 19, 1989
    Date of Patent: December 24, 1991
    Assignee: Daikin Industries Ltd.
    Inventors: Kenji Mikami, Yoshio Iwai, Nobuyoshi Iwashita, Yasuhisa Furutaka