Patents by Inventor Fumimasa Fukazawa

Fumimasa Fukazawa 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).

  • Hollow particles of crosslinked melamine resin having a uniform particle diameter and a process for producing the same
    Patent number: 5360832
    Abstract: A process for producing hollow particles of crosslinked melamine resin having a uniform particles diameter, said process comprising subjecting a water-soluble methyl-etherified-melamine resin precondensate to condensation reaction in the presence of a curing catalyst in an aqueous solution containing a water-soluble polymer with carboxyl groups or water-soluble copolymer of ethylenically unsaturated carboxylic acid monomer, when the reaction liquid becomes turbid, adding to the reaction mixture a substance which dissolves or swells the melamine resin, and continuing the condensation reaction, if necessary.
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: November 1, 1994
    Assignee: Honen Corporation
    Inventors: Masami Bito, Satoshi Konishi, Fumimasa Fukazawa
  • Process for producing particles of crosslinked melamine resin having a uniform particle diameter
    Patent number: 5246616
    Abstract: A process for producing the particles of crosslinked melamine resin having a uniform diameter in the following manner that water soluble precondensate of methyl-etherified melamine resin undergoes condensation reaction to give particles of crosslinked melamine resin having a uniform diameter, the condensation reaction is performed in an aqueous solution adjusted to a certain pH at 20.degree. to 70.degree. C., the aqueous solution contains a copolymer of acrylamide or methacrylamide with acrylic acid or methacrylic acid, a partial hydrolyzate of acrylamide or methacrylamide, or a saponified product of acrylonitrile, the pH adjustment is accomplished by an organic acid such as acetic acid, oxalic acid, formic acid, and p-toluenesulfonic acid, or an inorganic acid such as sulfuric acid and hydrochloric acid, which functions as a curing agent, and the preferred pH is in the range of 5 to 8.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: September 21, 1993
    Assignee: Honen Corporation
    Inventors: Masami Bito, Satoshi Konishi, Fumimasa Fukazawa
  • Hollow particles of crosslinked melamine resin having a uniform particles diameter and a process for producing the same
    Patent number: 5190983
    Abstract: A process for producing hollow particles of crosslinked melamine resin having a uniform particles diameter, said process comprising subjecting a water-soluble methyl-etherified-melamine resin precondensate to condensation reaction in the presence of a curing catalyst in an aqueous solution containing a water-soluble polymer with carboxyl groups or water-soluble copolymer of ethylenically unsaturated carboxylic acid monomer, when the reaction liquid becomes turbid, adding to the reaction mixture a substance which dissolves or swells the melamine resin, and continuing the condensation reaction, if necessary.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: March 2, 1993
    Assignee: Honen Corporation
    Inventors: Masami Bito, Satoshi Konishi, Fumimasa Fukazawa