Patents by Inventor Tsuyoshi Hongo

Tsuyoshi Hongo 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).

  • Oriented polyester film
    Patent number: 4693932
    Abstract: An oriented polyester film comprising ethylene terephthalate as the major repeating units, which comprises 0.01 to 1.0% by weight of silica particles and/or titanium dioxide particles having each an average particle size of 0.01 to 0.5.mu. and 0.005 to 1.0% by weight of calcium carbonate having an average particle size of 0.01 to 0.5.mu., which provides an oriented polyester film for the base film of video tape which has a flatness on the surface and has excellent slipperiness, abrasion resistance and running characteristics as well as excellent magnetic transducer characteristics.
    Type: Grant
    Filed: May 2, 1986
    Date of Patent: September 15, 1987
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Katsuaki Kuze, Yasuhiro Nishino, Yujiro Matsuyama, Kozo Maeda, Masahiro Kobayashi, Tadashi Okudaira, Tsuyoshi Hongo, Osamu Makimura
  • Oriented polyester film containing calcium carbonate and kaolinite
    Patent number: 4595715
    Abstract: An oriented polyester film comprising ethylene terephthalate as the major repeating unit, which comprises particles of kaolinite and calcium carbonate uniformly dispersed therein, said kaolinite and said calcium carbonate having each an average particle size of 0.05 to 0.8 micron and being contained in such amounts as satisfying the following equations:70.ltoreq.D.times.A.ltoreq.1000 (I)1000.ltoreq.A+B.ltoreq.10000 (II)0.1.ltoreq.B/A.ltoreq.25 (III)wherein D is an average particle size (micron) of calcium carbonate, A is a content (ppm) of calcium carbonate and B is a content (ppm) of kaolinite, said oriented polyester film being excellent in flatness, slipperiness, abrasion resistance, etc. with a small number of coarse particles.
    Type: Grant
    Filed: September 7, 1984
    Date of Patent: June 17, 1986
    Assignees: Toyo Boseki Kabushiki Kaisha T/A Toyobo Co., Ltd., Nippon Magphane Kabushiki Kaisha
    Inventors: Katsuaki Kuze, Yujiro Matsuyama, Kozo Maeda, Takeshi Ota, Masahiro Kobayashi, Tsuyoshi Hongo, Osamu Makimura
  • Shaped article of polymers prepared from (.beta.-hydroxyethyl)-trimellitic acid imide
    Patent number: 4140677
    Abstract: A shaped article having a refractive index of not less than 1.625 at least in one direction and possessing excellent physical properties and various uses, which can be prepared by stretching a molded product, which is made of a polymeric material comprising at least 80 mol% of the repeating units of the formula: ##STR1## and having an intrinsic viscosity of not less than 0.25 dl/g when measured in a mixture of phenol and sym.-tetrachloroethane in a weight ratio of 6 : 4 at 30.degree. C. and has a refractive index of not more than 1.610 at least in one direction, at a temperature of 120.degree. to 230.degree. C. with a stretch ratio of 2 to 20 in the same direction as the refractive index is measured, or by melt extruding the polymeric material at a temperature higher than 230.degree. C. and not higher than 360.degree. C. while or immediately followed by stretching with a deformation speed of not less than 20 times the speed of the melt extrusion.
    Type: Grant
    Filed: June 10, 1977
    Date of Patent: February 20, 1979
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Keiichi Uno, Hikoichi Nagano, Tsuyoshi Hongo, Takahito Miyagawa, Koichi Matsunami