Patents by Inventor Shin Hosonuma

Shin Hosonuma 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).

  • Polarizing film
    Patent number: 5354513
    Abstract: Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.
    Type: Grant
    Filed: October 13, 1993
    Date of Patent: October 11, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Katsuji Nakamura, Junichi Fujio, Shin Hosonuma, Masakatsu Nakatsuka, Tsutomu Nishizawa
  • Polarizing film
    Patent number: 5286418
    Abstract: Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.
    Type: Grant
    Filed: July 3, 1991
    Date of Patent: February 15, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Katsuji Nakamura, Junichi Fujio, Shin Hosonuma, Masakatsu Nakatsuka, Tsutomu Nishizawa
  • Polarizing film
    Patent number: 5059356
    Abstract: Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.
    Type: Grant
    Filed: September 6, 1990
    Date of Patent: October 22, 1991
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Katsuji Nakamura, Junichi Fujio, Shin Hosonuma, Masakatsu Nakatsuka, Tsutomu Nishizawa
  • Colored polarizing film and method of making same
    Patent number: 4842781
    Abstract: Disclosed is a colored polarizing film having excellent durability which comprises (a) an organic polymer film or sheet and (b) at least one dichroic dye having an azo, anthraquinone, thioindigo, perylene or phthalone structure containing no water-soluble group. Also disclosed is a method of making a colored polarizing film using an organic polymer film or sheet formed of a polyamide or polyester resin, which comprises the steps of (a) blending (preferably, dry blending) a dichroic dye with the resinous polymer in advance, (b) melting the resulting blend and forming it into a film, and then (c) stretching the film in at least one direction.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: June 27, 1989
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tsutomu Nishizawa, Yasuyuki Yamada, Junichi Fujio, Shin Hosonuma
  • Polarizing film
    Patent number: 4824882
    Abstract: Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.
    Type: Grant
    Filed: May 20, 1986
    Date of Patent: April 25, 1989
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Katsuji Nakamura, Junichi Fujio, Shin Hosonuma, Masakatsu Nakatsuka, Tsutomu Nishizawa