Patents by Inventor Tatsuhide Hosomi

Tatsuhide Hosomi 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 purifying polycarbonate resin solution
    Patent number: 6384185
    Abstract: A process for purifying a polycarbonate resin solution which comprises passing a water-in-oil dispersion type (W/O) emulsion composed of a mixture of an organic solvent solution containing a polycarbonate resin with a aqueous solution and having water particles with an average diameter of 1 to 100 &mgr;m in an oil through a metallic filter having a filtering precision of 10 to 200 &mgr;m, and then, settling the mixture for 1 to 30 minutes to perform separation between the organic solvent solution containing a polycarbonate resin and the aqueous solution containing contaminations.
    Type: Grant
    Filed: January 5, 2000
    Date of Patent: May 7, 2002
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Minoru Inada, Tatsuhide Hosomi, Toshiaki Asoh, Makoto Mizutani
  • Production method of polycarbonate resin pellets
    Patent number: 5717055
    Abstract: A method of producing polycarbonate resin pellets containing very less residual organic solvent and low molecular weight volatile matters and having a high transparency by melt-kneading a polycarbonate resin powder in an extruder equipped with a screw having a material seal mechanism, and vents, and devolatilizing the residual organic solvent and/or the low molecular weight volatile matters at the vent portion and then extruding the molten resin.The polycarbonate resin pellets are suitable for optical grade articles and automobile lenses.
    Type: Grant
    Filed: June 11, 1996
    Date of Patent: February 10, 1998
    Assignee: Mitsubishi Gas Chemical Company, LTD.
    Inventors: Tatsuhide Hosomi, Toshikazu Umemura, Toshiaki Takata, Yuji Mori
  • Process for producing powder aggregate particle of high molecular weight polycarbonate resin
    Patent number: 5182363
    Abstract: Disclosed is a process for producing powder aggregate particle of high molecular weight polycarbonate resin which comprises adding a poor solvent to a solution containing 3 to 8% by weight of high molecular weight polycarbonate resin having a viscosity average molecular weight of at least 70,000 in a solvent in a ratio of the poor solvent to the solution of the polycarbonate resin of 0.2 to 0.6 by volume, continuously pouring the resulting mixture into water heated to a higher temperature than a boiling point of a solvent of the solution of the polycarbonate resin, thereby suspending the mixture in the warm water, distilling out the solvent and the poor solvent from the mixture, thereby obtaining a slurry of the polycarbonate resin and water in the following ratio by volume:Solvent/polycarbonate resin.ltoreq.0.55Solvent/poor solvent.ltoreq.0.7,and recycling at least a portion of the slurry to a wet-process pulverizer, while further distilling out the solvent and the poor solvent from the slurry.
    Type: Grant
    Filed: November 21, 1991
    Date of Patent: January 26, 1993
    Assignee: Mitsubishi Gas Chemical Co., Inc.
    Inventors: Toshiaki Asoh, Tatsuhide Hosomi