Patents by Inventor Yoshihiko Katayama

Yoshihiko Katayama 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: 11383413
    Abstract: A manufacturing method of a polygonal mirror using a metal mold including a first mold, a second mold, a third mold, and a fourth mold includes a step of forming the molded member by providing the third mold and the fourth mold between the first mold and the second mold in a state in which the third mold and the fourth mold are in contact with each other and then by injecting a resin material into the metal mold, and a step of separating the third mold from the first crossing surface of the molded member in a direction crossing the first crossing surface.
    Type: Grant
    Filed: April 15, 2019
    Date of Patent: July 12, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Fumihiko Yamaya, Hiroki Katayama, Yoshihiko Tanaka, Takatoshi Tanaka, Mitsuhiro Ohta, Atsushi Takata, Naoki Matsushita
  • Patent number: 11385457
    Abstract: In an optical scanning device, an outer wall closest to a circumscribed circle of a rotating polygon mirror has a space in a position facing to a position of a reflection surface of the rotating polygon mirror in an axial direction of a rotating shaft. A part of a cover is provided in a position farther from the circumscribed circle than the outer wall so as to close the space, when the optical scanning device is viewed in a direction perpendicular to the axial direction of the rotating shaft.
    Type: Grant
    Filed: September 9, 2020
    Date of Patent: July 12, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yoshihiko Tanaka, Hisanori Kobayashi, Naoki Matsushita, Takatoshi Tanaka, Mitsuhiro Ohta, Hiroki Katayama
  • Patent number: 11371611
    Abstract: There is provided a seal member for a bearing comprising a molded rubber article and a core metal, wherein the molded rubber article is produced by vulcanization-molding a rubber composition comprising 100 parts by mass of a rubber (A) containing an acrylic acid ester as a main component, 1 to 30 parts by mass of a carbon material (B), and 10 to 100 parts by mass of a carbon black (C) having a DBP oil absorption of 20 mL/100 g or more and less than 150 mL/100 g; the carbon material (B) is a carbon nanotube (B1) or a carbon black (B2) having a DBP oil absorption of 150 mL/100 g or more and 1000 mL/100 g or less; and a volume resistivity of the molded rubber article is 1×106 ?·cm or less.
    Type: Grant
    Filed: March 9, 2020
    Date of Patent: June 28, 2022
    Assignee: UCHIYAMA MANUFACTURING CORP.
    Inventors: Keiko Ikeda, Yoshihiko Yamaguchi, Tomohisa Yamamoto, Tatsuo Katayama
  • Patent number: 4471066
    Abstract: A catalyst useful for polymerizing olefins which comprises a solid catalyst component [A] and an organometallic component [B], the solid catalyst component [A] being obtained by reacting (1) an organometallic compound with (2) a transition metal compound selected from the group consisting of a titanium compound, a vanadium compound, a mixture of a titanium compound and a vanadium compound and a mixture of a titanium compound and a zirconium compound, in the presence of (3) a solid reaction product of (a) an organomagnesium compound of the formulaM.sub..alpha. MgR.sub.p X.sub.q.D.sub.rwherein.alpha., p, q and r each independently is 0 or a number greater than 0,p+q=m.alpha.+20.ltoreq.q/(.alpha.
    Type: Grant
    Filed: February 3, 1983
    Date of Patent: September 11, 1984
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Masayasu Furusato
  • Patent number: 4423185
    Abstract: Disclosed is a soft and flexible thermoplastic resinous composition having high impact and tear resistances, a good processability and a good thermal adhesion to a wide variety of plastic and other materials. The resinous composition consists essentially of 5 to 70 wt. % of a thermoplastic polyurethane elastomer and 30 to 95 wt. % of a modified polyolefin or an olefin copolymer, having functional groups of at least one type selected from carboxyl, carboxylate salt, carboxylic anhydride, amide, hydroxyl and epoxy groups.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: December 27, 1983
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Koichi Matsumoto, Yoshihiko Katayama, Hisaya Sakurai
  • Patent number: 4410595
    Abstract: Disclosed is a soft and flexible thermoplastic resinous composition having high impact and tear resistances, a good processability and a good thermal adhesion to a wide variety of plastic and other materials. The resinous composition consists essentially of 5 to 70 wt. % of a thermoplastic polyurethane elastomer and 30 to 95 wt. % of a modified polyolefin or an olefin copolymer, having functional groups of at least one type selected from carboxyl, carboxylate salt, carboxylic anhydride, amide, hydroxyl and epoxy groups.
    Type: Grant
    Filed: August 31, 1982
    Date of Patent: October 18, 1983
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Koichi Matsumoto, Yoshihiko Katayama, Hisaya Sakurai
  • Patent number: 4381252
    Abstract: A catalyst suitable for polymerizing an .alpha.-olefin, comprising a solid catalyst component [A] and an organometal compound [B], the solid catalyst component [A] being prepared by reacting an organomagnesium compound (1) soluble in a hydrocarbon medium and represented by the general formula,MgR.sub.p.sup.1 R.sub.q.sup.2 X.sub.r.Z.sub.swhereinR.sup.1 is a hydrocarbon group having 2 to 3 carbon atoms;R.sup.2 is a hydrocarbon group having 4 to 20 carbon atoms and the difference in number of carbon atoms between R.sup.1 and R.sup.2 is at least 2;X is an electronegative group having an oxygen atom, a nitrogen atom or a sulfur atom;Z is an organometal compound of aluminum, boron, beryllium, zinc, silicon or lithium;p and q each is a number above 0 to 1;r is a number from 0 to 1;p+q+r=2; ands is a number from 0.02 to 0.09,with a titanium and/or vanadium compound (2) having at least one halogen atom; and a process for polymerizing an .alpha.-olefin employing the same catalyst.
    Type: Grant
    Filed: June 1, 1981
    Date of Patent: April 26, 1983
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Masayasu Furusato
  • Patent number: 4376720
    Abstract: An olefin polymerization catalyst which shows an extremely high activity even at low temperatures and is suited for the production of blow molding polymers, said catalyst comprising a solid component constituted by a chromium compound supported by an inorganic oxide carrier, and an organomagnesium complex compound soluble in the inert hydrocarbons and represented by the general formula: M.sub..alpha. Mg.sub..beta. R.sub.p.sup.1 R.sub.q.sup.2 R.sub.r.sup.3 X.sub.s Y.sub.t (wherein .alpha.>0, .beta.>0, p.gtoreq.0, q.gtoreq.0, r.gtoreq.0, s>0, t.gtoreq.0, 0<(s+t)/(.alpha.+.beta.).ltoreq.1.5 and p+q+r+s+t=m.alpha.+2.beta.; M is an atom selected from the group consisting of aluminum, zinc, boron, beryllium and lithium; m is the valence of M; R.sup.1, R.sup.2 and R.sup.3 may be same or different and represent respectively a hydrocarbon radical having 1 to 20 carbon atoms; X is OSiR.sup.5 R.sup.6 R.sup.7 ; and Y is a radical selected from the group consisting of OR.sup.4, OSiR.sup.5 R.sup.6 R.sup.7, NR.
    Type: Grant
    Filed: December 1, 1980
    Date of Patent: March 15, 1983
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Shigeo Tsuyama
  • Patent number: 4342708
    Abstract: Novel hydrocarbon-soluble isopropyl group-containing diorganomagnesium compounds and hydrocarbon solutions thereof are disclosed. The compound of the present invention has a high weight percent of Mg per one mol thereof, and the hydrocarbon solution of the present invention has a very low viscosity as compared with the conventional solutions. The hydrocarbon solution of the present invention can be prepared according any of various processes. If the reaction is carried out in an ether medium, the ether is substituted with a hydrocarbon solvent by removing the ether from the reaction mixture by distillation in the presence of the hydrocarbon solvent.
    Type: Grant
    Filed: July 16, 1980
    Date of Patent: August 3, 1982
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Shigeo Tsuyama
  • Patent number: 4336352
    Abstract: A polyethylene composition comprising a mixture of three kinds of polyethylenes (A), (B) and (C) characterized in that:(i) the viscosity average molecular weight of (A) is 1,000-100,000, the viscosity average molecular weight of (B) is 100,000-1,000,000, the viscosity average molecular weight of (C) is 400,000-6,000,000, the molecular weight ratio of (B) to (A), i.e. B/A, is 2-200 and the molecular weight ratio of (C) to (B), i.e. C/B, is 1.5 or more.(ii) the mixing ratio of (A) to (B) is 30/70 to 70/30 and the mixing ratio of (C) is 1-10% by weight based on the total composition, and(iii) the melt index of the composition is 0.001-1, and a process for producing said composition. This polyethylene composition is excellent in physical properties in that it has an appropriate die swell, a high melt tension and an excellent moldability and exhibits a high stiffness and a high ESCR.
    Type: Grant
    Filed: August 11, 1980
    Date of Patent: June 22, 1982
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Shigeru Mizutani
  • Patent number: 4335229
    Abstract: A process for polymerizing an .alpha.-olefin comprising contacting the olefin in liquid phase at a temperature of about 120.degree. to about 320.degree. C. with a catalyst comprising a component (A) and an organometal component (B), the component (A) being produced by reacting a hydrocarbon-soluble organomagnesium component (i) of the formula,M.sub..alpha. MgR.sub.p.sup.1 R.sub.q.sup.2 X.sub.r.sup.1 X.sub.s.sup.2 D.sub.twherein.alpha., p, q, r and s each independently is 0 or a number greater than 0,t is a number greater than 0,p+q+r+s=m.alpha.+2,O.ltoreq.(r+s)/(.alpha.+1)<2,m is the valance of M,M is a metal of the 1st to 3rd groups of the Periodic Table,R.sup.1 and R.sup.2 each independently is a hydrocarbon group having 1 to 20 carbon atoms,X.sup.1 and X.sup.
    Type: Grant
    Filed: August 13, 1980
    Date of Patent: June 15, 1982
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Masayasu Furusato
  • Patent number: 4330646
    Abstract: A process for polymerizing an .alpha.-olefin comprising contacting the olefin in liquid phase at a temperature of about 120.degree. to about 320.degree. C. with a catalyst comprising a component (A) and an organometal component (B), the component (A) being produced by reacting a hydrocarbon-soluble organomagnesium component (i) of the formulaM.sub..alpha. Mg.sub..beta. R.sub.p.sup.1 R.sub.q.sup.2 X.sub.r.sup.1 X.sub.s.sup.2wherein.alpha., p, q, r and s each independently is 0 or a number greater than 0,.beta. is 1 or a number greater than 1,p+q+r+s=m.alpha.+2.beta.,0.ltoreq.(r+s)/(.alpha.+.beta.)<2,m is the valence of M,M is a metal of the 1st to 3rd groups of the Periodic Table,R.sup.1 and R.sup.2 each independently is a hydrocarbon group having 1 to 20 carbon atoms,X.sup.1 and X.sup.
    Type: Grant
    Filed: July 21, 1980
    Date of Patent: May 18, 1982
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Masayasu Furusato
  • Patent number: 4330647
    Abstract: A process for polymerizing an .alpha.-olefin comprising contacting the olefin in liquid phase at a temperature of about 120.degree. to 320.degree. C. with a catalyst comprising a component (A) and an organometal component (B), the component (A) being produced by reacting a hydrocarbon-soluble organomagnesium component (i) of the formula,M.sub..alpha. MgR.sub.p.sup.1 R.sub.q.sup.2 X.sub.r.sup.1 X.sub.s.sup.2 D.sub.t.alpha., p, q, r, s and t each independently is O or a number greater than 0,p+q+r+s=m.alpha.+2O.ltoreq.(r+s)/(.alpha.+1)<2,m is the valence of M, M is a metal of the 1st to 3rd groups of the Periodic Table,R.sup.1 is a hydrocarbon group having 1 to 20 carbon atoms, R.sup.2 is a secondary or tertiary alkyl group having 3 to 20 carbon atoms,X.sup.1 and X.sup.2 each independently is a hydrogen atom or an organic electronegative group containing O, N or S,D is an electron donor,with a compound (ii) of the formula,R.sub.a.sup.3 C Y.sub.4-awhereinR.sup.
    Type: Grant
    Filed: August 13, 1980
    Date of Patent: May 18, 1982
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Masayasu Furusato
  • Patent number: 4330651
    Abstract: A catalyst for the solution polymerization of .alpha.-olefins is prepared by admixing component (A) with an organometal component (B), component (A) being prepared by reacting a specific hydrocarbon-soluble organomagnesium compound with an aluminum compound and contacting the obtained product with a titanium and/or vanadium compound.
    Type: Grant
    Filed: August 13, 1980
    Date of Patent: May 18, 1982
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Masayasu Furusato
  • Patent number: 4264472
    Abstract: A catalyst for preparing an .alpha.-olefin polymer having a broad molecular weight distribution and excellent physical properties, which comprises a solid catalyst component (A) and an organometal compound (B), the solid catalyst component (A) being obtained by reduction with an organomagnesium solution of the thermal decomposition solid product of special titanium compounds.
    Type: Grant
    Filed: August 29, 1979
    Date of Patent: April 28, 1981
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Tadashi Ikegami, Hisaya Sakurai, Yoshihiko Katayama, Shigeo Tsuyama, Yukitoshi Iwashita
  • Patent number: 4230831
    Abstract: An intimately melted and homogenized polyethylene composition having excellent physical properties and moldability and comprising a high-medium density polyethylene having a high molecular weight (A), a high-medium density polyethylene having a low molecular weight (B) and a low density polyethylene (C) characterized in that:(i) the average molecular weight of (A) is 100,000-1,000,000, the average molecular weight of (B) is 1,000-100,000, the molecular weight ratio of (A) to (B) is 5-200, and (C) has an intrinsic viscosity [.eta.] of 0.70 dl/g or more in decalin at 135.degree. C. and an expansion factor of 3.3 or more, and(ii) the mixing ratio (A)/(B) is 30/70 to 80/20 and the mixing ratio of (C) in the composition is within the range from 1% by weight to less than 15% by weight.
    Type: Grant
    Filed: September 25, 1979
    Date of Patent: October 28, 1980
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Kisoo Moriguchi, Shigeru Mizutani
  • Patent number: 4219453
    Abstract: An ethylene polymer film exhibiting improved impact strength and tear strength is provided. This film is made of an inorganic filler-incorporated ethylene polymer composition which is comprised of:(a) 35-90 wt.%, based on the ethylene polymer composition, of an ethylene polymer having a melt index of 0.005-0.2 and a specific gravity of 0.94- 0.98 as measured at a temperature of 23.degree. C.,(b) 10-65 wt.%, based on the ethylene polymer composition, of a finely divided inorganic filler particle having an average particle size of 0.01-10 microns,(c) 0.1-10 wt.parts, based on 100 wt.parts of the ingredient (b), of a higher fatty acid,(d) 0.5-15 wt.parts, based on 100 wt.parts of the ingredient (b), of a metal salt of a higher fatty acid, and(e) 0.05-5 wt.parts, based on 100 wt.parts of the ingredient (b), of a stabilizer composition predominantly comprised of a phenolic stabilizer.The ethylene polymer film is produced by extruding the ethylene polymer composition at 150.degree.-250.degree. C.
    Type: Grant
    Filed: September 15, 1978
    Date of Patent: August 26, 1980
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Kisoo Moriguchi, Yoshihiko Katayama
  • Patent number: 3969313
    Abstract: A thermoplastic composite composition comprisingI. about 95 to about 30 percent by weight of a thermoplastic material andIi. about 5 to about 70 percent by weight of a polyolefin composition comprisingA. about 15 to about 60 percent by weight of a polyolefin andB. about 85 to about 40 percent by weight of at least one reactive inorganic filler,Said reactive inorganic filler having been prepared by effecting reaction betweenA. an inorganic material substantially comprising at least one compound selected from the group consisting of metal carbonates, metal hydroxides and metal oxides, said metal being selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, zinc, cadmium and aluminum, said compound having a number average particle diameter of from about 0.01 .mu.. to about 50 .mu.. and a maximum particle diameter of about 100 .mu.., andB.
    Type: Grant
    Filed: June 5, 1973
    Date of Patent: July 13, 1976
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Itsuho Aishima, Yukichi Takashi, Yoshihiko Katayama, Kenji Arimoto, Koichi Matsumoto