Patents by Inventor Toshiyuki Nakatuka

Toshiyuki Nakatuka 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).

  • Injector assembly capable of preventing subsequent dripping, as well as plunger and seal member for the injector assembly
    Patent number: 6796217
    Abstract: A plunger for being inserted in a tubular barrel in an axially movable manner includes a plunger body having a distal end positioned within the barrel and a proximal end positioned outside of the barrel, and a seal member disposed on the distal end of the plunger body. The seal member has a base portion extending from the plunger body towards the distal end of the barrel, and a flange portion radially outwardly extending from the base portion and having a peripheral edge contacting an inner circumference of the barrel so as to define an accommodation space within the barrel.
    Type: Grant
    Filed: August 14, 2002
    Date of Patent: September 28, 2004
    Assignees: Taisei Kako Co., Inc., Shofu Inc.
    Inventors: Taiji Horita, Ippei Matsumoto, Toshiyuki Nakatuka
  • Dental fillers
    Patent number: 6620861
    Abstract: There are provided an inorganic filler, multi-functional filler, an organic compound filler, a modified filler, and a dental coloring filler suitable in use as a filler in a dental composition, compositions having a resin matrix of an organic polymer material, as well as a process for producing the same. Disclosed are an inorganic filler which comprises an inorganic fine particle, wherein the surface of the inorganic fine particle is covered with polysiloxane. Also disclosed is a multi-functional filler which comprises an inorganic fine particle containing an acid reactive element, wherein a cement reactive phase is formed on the surface of the inorganic fine particle, and the cement reactive phase is further covered with polysiloxane. Also disclosed is an organic compound filler which comprises an organic-inorganic polymer particle or an organic polymer particle, wherein the surface of the organic-inorganic polymer particle or an organic polymer particle is covered with an inorganic film.
    Type: Grant
    Filed: November 17, 2000
    Date of Patent: September 16, 2003
    Assignee: Kabushiki Kaisha Shofu
    Inventors: Toshiyuki Nakatuka, Yasuhisa Yasuda, Katsuya Kimoto, Mitsuharu Mizuno, Noriyuki Negoro
  • Injector assembly capable of preventing subsequent dripping, as well as plunger and seal member for the injector assembly
    Publication number: 20030035744
    Abstract: A plunger for being inserted in a tubular barrel in an axially movable manner includes a plunger body having a distal end positioned within the barrel and a proximal end positioned outside of the barrel, and a seal member disposed on the distal end of the plunger body. The seal member has a base portion extending from the plunger body towards the distal end of the barrel, and a flange portion radially outwardly extending from the base portion and having a peripheral edge contacting an inner circumference of the barrel so as to define an accommodation space within the barrel.
    Type: Application
    Filed: August 14, 2002
    Publication date: February 20, 2003
    Inventors: Taiji Horita, Ippei Matsumoto, Toshiyuki Nakatuka