Patents by Inventor Hidefumi Harada

Hidefumi Harada 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).

  • Patent number: 5736239
    Abstract: The present invention provides a novel coating layer or a film having a flip-flop property, comprising a mica-like red iron oxide of less than 0.25 .mu.m in thickness containing aluminum in solid solution and a solid resin component, with the proportion of said iron oxide being 0.1-20 parts by weight per 100 parts by weight of the solid resin component.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: April 7, 1998
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Hidefumi Harada, Shigeru Nagaoka
  • Patent number: 5714627
    Abstract: A process for producing an aromatic carbonate which comprises: reacting a dialkyl carbonate represented by general formula (1) with an aromatic carboxylic acid aryl ester represented by general formula (2) in the presence of a catalyst to produce an aromatic carbonate represented by one or both of general formulae (3) and (4):R--OCOO--R (1)Ar'--COO--Ar (2)Ar--OCOO--R (3)Ar--OCOO--Ar (4)wherein R represents an alkyl group having from 1 to 4 carbon atoms, and Ar and Ar' each represents an unsubstituted phenyl group or a phenyl group substituted by a substituent selected from the group consisting of alkyl, alkoxy, aryl, aryloxy and a halogen atom.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: February 3, 1998
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Masamichi Mizukami, Takuo Ohshida, Hiroaki Ohgi, Hidefumi Harada
  • Patent number: 5563199
    Abstract: A potassium hexatitanate whisker having a tunnel structure containing aluminum and niobium impurities in such amounts that Al.sub.2 O.sub.3 /Nb.sub.2 O.sub.5 molar ratio is 0.6 or higher and composite materials using the same. Also disclosed are processes for producing composite materials using the potassium hexatitanate whiskers having a tunnel structure with a light alloy or a thermoplastic resin.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: October 8, 1996
    Assignee: Titan Hogyo Kabushiki Kaisha
    Inventors: Hidefumi Harada, Yasuo Inoue, Eiji Sadanaga
  • Patent number: 5543474
    Abstract: There is provided a resin composition having well balanced moldability, heat resistance and mechanical strength, which comprises (A) all aromatic polyamideimide resin and (B) a Polyester resin, (C) a polyphenylene sulfide resin or (D) a resin capable of forming an anisotropic molten phase, said aromatic polyamideimide resin containing 5 to 95 mol % of a recurring unit of the formula (1) and 5 to 95 mol % of at least one of a recurring unit of the formula (2) and a recurring unit of the formula (3). Said aromatic polyamideimide resin is prepared by conducting a polymerization reaction of an aromatic tricarboxylic acid anhydride and at least any one of all aromatic dicarboxylic acid and an aliphatic dicarboxylic acid with a diisocyanate compound in plural steps in which in the first step the polymerization reaction is conducted in a temperature range of 50.degree. to 110.degree. C. and in the second and subsequent steps the polymerization reaction is conducted in a temperature range of higher than 110.degree.
    Type: Grant
    Filed: October 17, 1994
    Date of Patent: August 6, 1996
    Assignee: Mitsubishi Gas Company, Inc.
    Inventors: Takao Kawaki, Akikazu Amagai, Toshiaki Yamada, Hidefumi Harada, Hajime Ban, Yuji Takeda, Koji Yamamoto
  • Patent number: 5501264
    Abstract: A potassium hexatitanate whisker having a tunnel structure containing aluminum and niobium impurities in such amounts that Al.sub.2 O.sub.3 /Nb.sub.2 O.sub.3 molar ratio is 0.6 or higher and composite materials using the same. Also disclosed are processes for producing composite materials using the potassium hexatitanate whiskers having a tunnel structure with a light alloy or a thermoplastic resin.
    Type: Grant
    Filed: August 12, 1994
    Date of Patent: March 26, 1996
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Hidefumi Harada, Yasuo Inoue, Eiji Sadanaga
  • Patent number: 5500043
    Abstract: The object of the present invention is to provide a lustrous pigment free from the defects of conventional platelike or flaky iron oxide pigments that a mechanical strength is poor, adjustable colors are restricted and that a pigment lustrous is weak even if colors can adjusted variously and a method of producing the same. The present invention relates to a flaky iron oxide lustrous pigment having a hematite structure characterized by containing at least one of the elements selected from Zn, Sb and Sn and Al in solid solution and its platelike crystal having an average thickness of 0.8 .mu.m or more, preferably the content of at least one of the elements selected from Zn, Sb and Sn being in the range of 0.05 to 0.5 weight % as oxides and the content of Al being in the range of 0.5 to 3 weight % as Al.sub.2 O.sub.3.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 19, 1996
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Hidefumi Harada, Takanori Yamasaki, Eizi Sadanaga, Teruyoshi Okazaki
  • Patent number: 5407754
    Abstract: Reinforcement potassium hexatitanate fiber having an average fiber length of 8-30 .mu.m, an average fiber diameter of 0.2-0.7 .mu.m and a specific surface area of 2-4 m.sup.2 /g and a composite materials comprising the whiskers and a light alloy or thermoplastic resin. Also disclosed a process for producing the whiskers.
    Type: Grant
    Filed: June 19, 1992
    Date of Patent: April 18, 1995
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Hidefumi Harada, Yasuo Inoue, Eiji Sadanaga
  • Patent number: 5387652
    Abstract: A resin composition comprising a melt-kneaded product of (A) an aromatic polyamideimide resin (Component A) which is obtained by polymerizing an aromatic tricarboxylic acid anhydride and a diisocyanate in a solvent under conditions where an amide group is substantially formed first and then an imide group is formed, and which has at least one recurring unit of the formula (1), ##STR1## wherein Ar is a trivalent aromatic hydrocarbon group having at least one 6-membered carbon ring, and R is a divalent aromatic hydrocarbon group or an aliphatic hydrocarbon group, and (B) a polyphenylene sulfide resin (Component B); and the molded article obtained by molding said resin composition.
    Type: Grant
    Filed: September 22, 1993
    Date of Patent: February 7, 1995
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Takao Kawaki, Akikazu Amagai, Toshiaki Yamada, Hidefumi Harada, Hajime Ban
  • Patent number: 5366816
    Abstract: A potassium hexatitanate whisker having a tunnel structure containing aluminum and niobium impurities in such amounts that Al.sub.2 O.sub.3 /Nb.sub.2 O.sub.5 molar ratio is 0.6 or higher and composite materials using the same. Also disclosed are processes for producing composite materials using the potassium hexatitanate whiskers having a tunnel structure with a light alloy or a thermoplastic resin.
    Type: Grant
    Filed: June 19, 1992
    Date of Patent: November 22, 1994
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Hidefumi Harada, Yasuo Inoue, Eiji Sadanaga
  • Patent number: 5340645
    Abstract: Potassium hexatitanate fibers having a tunnel structure and a free potassium content of 5 ppm or less can be produced by mixing together a titanium containing compound and a potassium containing compound in a ratio represented by the formula K.sub.2 O.nTiO.sub.2 (wherein n=from 2 to 4); firing the mixture at 900.degree. to 1,200.degree. C. to produce mass of potassium titanate fibers; dipping the mass of product in either cold or hot water to disintegrate the mass of potassium titanate fibers into individual single fibers; adding an acid to the slurry to adjust the pH value to 9.3-9.7, thereby changing the composition of the potassium titanate fibers so that the molar ratio of TiO.sub.2 /K.sub.2 O is in the range of from 5.95 to 6.00; heating the fibers at 950.degree. to 1,150.degree. C. for 1 hour or more; and washing the fibers with an acid. The potassium hexatitanate fibers, which have a minimal free potassium content, i.e.
    Type: Grant
    Filed: March 2, 1993
    Date of Patent: August 23, 1994
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Hidefumi Harada, Yasuo Inoue
  • Patent number: 5110586
    Abstract: A white colored deodorizer comprising zinc oxide and at least one oxide selected from the group consisting of aluminium oxide and silicon oxide and a method for preparation of it are disclosed.
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: May 5, 1992
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Tokumitsu Kurihara, Tatsuo Saito, Hidefumi Harada
  • Patent number: 5108739
    Abstract: A white colored deodorizer comprising titanium oxide and zinc oxide and a method for its preparation are disclosed.
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: April 28, 1992
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Tokumitsu Kurihara, Tatsuo Saito, Hidefumi Harada
  • Patent number: 5100659
    Abstract: A white colored deodorizer comprising titanium oxide and at least one alkaline earth metal oxide selected from the group consisting of magnesium oxide and calcium oxide and a method for preparation of it are disclosed.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: March 31, 1992
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Tokumitsu Kurihara, Tatsuo Saito, Hidefumi Harada
  • Patent number: 5084422
    Abstract: Potassium hexatitanate fibers having a tunnel structure and a free potassium content of 5 ppm or less can be produced by mixing together a titanium containing compound and a potassium containing compound in a ratio represented by the formula K.sub.2 O.nTiO.sub.2 (wherein n=from 2 to 4); firing the mixing at 900.degree. to 1,200.degree. C. to produce mass of potassium titanate fibers; dipping the mass of product in either cold or hot water to disintegrate the mass of potassium titanate fibers into individual single fibers; adding an acid to the slurry to adjust the pH value to 9.3-9.7, thereby changing the composition of the potassium titanate fibers so that the molar ratio of TiO.sub.2 /K.sub.2 O is in the range of from 5.95 to 6.00; heating the fibers at 950.degree. to 1,150.degree. C. for 1 hour to more; and washing the fibers with an acid. The potassium hexatitanate fibers, which have minimal free potassium content, i.e.
    Type: Grant
    Filed: October 27, 1988
    Date of Patent: January 28, 1992
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Hidefumi Harada, Yasuo Inoue
  • Patent number: 4376656
    Abstract: Yellow iron oxide pigments having improved heat stability are prepared by subjecting an alkaline slurry of conventional yellow iron oxide, a soluble ferric salt, sodium aluminate, and a third metal component, exemplified by antimony ion or a zinc ion/titanium ion combination, to a hydrothermal (autoclave) treatment at about 100.degree.-240.degree. C. The separated solid product has a heat stability temperature (based on the color change from yellow to red when heated) appreciably higher than that of the starting iron oxide.
    Type: Grant
    Filed: October 16, 1981
    Date of Patent: March 15, 1983
    Assignee: Titan Kogyo K.K.
    Inventors: Jihei Senda, Yoshihiro Inoue, Toshiaki Uenishi, Hidefumi Harada, Kouji Nakata, Akio Akagi, Yakanori Yamasaki
  • Patent number: 4374677
    Abstract: Yellow iron oxide pigments having improved heat stability are prepared by subjecting an alkaline slurry of conventional yellow iron oxide, a soluble ferric salt, and sodium aluminate to a hydrothermal (autoclave) treatment at 100.degree.-240.degree. C., separating and slurrying the resultant solid product, and subjecting that product to a second hydrothermal treatment of 250.degree.-350.degree. C. The original iron oxide has a heat stability (based on color change from yellow to red) temperature of about 203.degree. C., while the final product shows a change at 270.degree. C.
    Type: Grant
    Filed: October 5, 1981
    Date of Patent: February 22, 1983
    Assignee: Titan Kogyo K.K. Japan
    Inventors: Jihei Senda, Yoshihiro Inoue, Toshiaki Uenishi, Hidefumi Harada, Kouji Nakata, Akio Akagi
  • Patent number: 4374676
    Abstract: Yellow iron oxide pigments having improved heat stability are prepared by mixing a conventional yellow iron oxide pigment with an aqueous alkaline solution of a soluble antimony compound. This yields a yellow pigment whose particle surface is coated with "antimony-bloom", and this product has a higher heat stability temperature than does the starting yellow iron oxide. When the product coated with "antimony-bloom" is subjected to hydrothermal treatment (autoclaving), the resultant material has a yet-higher heat stability temperature. Other, related treatments furnish products with improved heat stability temperatures.
    Type: Grant
    Filed: December 7, 1981
    Date of Patent: February 22, 1983
    Assignee: Titan Kogyo K.K.
    Inventors: Jihei Senda, Yoshihiro Inoue, Toshiaki Uenishi, Hidefumi Harada, Kouji Nakata, Akio Akagi, Takanori Yamasaki
  • Patent number: 4373963
    Abstract: Lustrous flaky red iron oxide pigments containing aluminum in solid solution are produced by applying hydrothermal treatment to iron oxyhydroxide or colloidal precipitates of a ferric hydroxide in an aqueous aluminate solution. Lustrous pigments exhibiting various colors different from those of titanium dioxide-coated mica pigments are produced by coating titanium dioxide hydrate or titanium dioxide on the surface of the grains of flaky red iron.
    Type: Grant
    Filed: September 3, 1981
    Date of Patent: February 15, 1983
    Assignee: Titan Kogyo K.K.
    Inventors: Toshiaki Uenishi, Hidefumi Harada, Katumasa Sasaki, Akio Akagi, Takanori Yamasaki
  • Patent number: 4291010
    Abstract: Synthetic yellow iron oxide (.alpha.-FeOOH) is dispersed in an aqueous ferric solution, and an adequate alkali solution and an aqueous aluminum salt solution are added. The resultant dispersion is subjected to a hydrothermal treatment at 150.degree.-250.degree. C. By this treatment, the surface of the synthetic yellow iron oxide is covered with a (FeAl)OOH (solid solution). Yellow iron oxides treated thus have an elevated resistivity to heat of about 50.degree. C. The modified synthetic yellow iron oxide thus obtained is non-toxic and can be used as a pigment in plastics and melt-type traffic paint.
    Type: Grant
    Filed: September 5, 1979
    Date of Patent: September 22, 1981
    Assignee: Titan Kogyo Kabushiki Kaisha
    Inventors: Jihei Senda, Yoshihiro Inoue, Toshiaki Uenishi, Hidefumi Harada, Kouji Nakata, Akio Akagi