Patents by Inventor Hirokazu Ohtoshi

Hirokazu Ohtoshi 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: 5480627
    Abstract: A method of treating a substrate for an electrophotographic photosensitive member by a process comprises the steps;a) cutting the surface of the substrate to remove the surface in the desired thickness; andb) bringing the cut surface of the substrate into contact with water having a temperature of from 5.degree. C. to 90.degree. C., having a resistivity of not less than 11 M.OMEGA..multidot.cm at 25.degree. C., containing fine particles with a particle diameter of not smaller than 0.2 .mu.m in a quantity of not more than 10,000 particles per milliliter, containing microorganisms in a total viable cell count of not more than 100 per milliliter and containing an organic matter in a quantity of not more than 10 mg per liter, for at least 10 seconds at a pressure of from 1 kg.multidot.f/cm.sup.2 to 300 kg.multidot.f/cm.sup.2.
    Type: Grant
    Filed: February 23, 1994
    Date of Patent: January 2, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tetsuya Takei, Hirokazu Ohtoshi, Ryuji Okamura, Hiroyuki Katagiri, Yasuyoshi Takai
  • Patent number: 5455138
    Abstract: A process for producing a light-receiving member comprising a substrate and provided thereon a blocking layer and a photoconductive layer each comprised of a non-monocrystalline material is disclosed in which the blocking layer is comprised of a non-monocrystalline material comprising silicon atoms as matrix and at least one kind of atoms selected from the group consisting of carbon atoms, oxygen atoms and nitrogen atoms, the process comprising forming the blocking layer and the photoconductive layer by plasma CVD using glow discharge decomposition of a starting material gas caused by applying to the starting material gas an electromagnetic wave with a frequency of from 20 MHz to 450 MHz.
    Type: Grant
    Filed: October 21, 1993
    Date of Patent: October 3, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryuji Okamura, Kazuyoshi Akiyama, Hitoshi Murayama, Koji Hitsuishi, Satoshi Kojima, Hirokazu Ohtoshi, Masaaki Yamamura
  • Patent number: 5314780
    Abstract: A method of treating a substrate for an electrophotographic photosensitive member by a process comprises the steps of;a) cutting the surface of the substrate to remove the surface in the desired thickness; andb) bringing the cut surface of the substrate into contact with water having a temperature of from 5.degree. C. to 90.degree. C., having a resistivity of not less than 11 M.OMEGA..multidot.cm at 25.degree. C., containing fine particles with a particle diameter of not smaller than 0.2 .mu.m in a quantity of not more than 10,000 particles per milliliter, containing microorganisms in a total viable cell count of not more than 100 per milliliter and containing an organic matter in a quantity of not more than 10 mg per liter, for at least 10 seconds at a pressure of from 1 kg.multidot.f/cm.sup.2 to 300 kg.multidot.f/cm.sup.2.
    Type: Grant
    Filed: February 26, 1992
    Date of Patent: May 24, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tetsuya Takei, Hirokazu Ohtoshi, Ryuji Okamura, Hiroyuki Katagiri, Yasuyoshi Takai
  • Patent number: 5284730
    Abstract: An electrophotographic light-receiving member has a surface layer of a non-single crystal material (Si.sub.x C.sub.y O.sub.z).sub.t H.sub.u F.sub.v (wherein 0.1.ltoreq.x.ltoreq.0.4, 0.4.ltoreq.y.ltoreq.0.7, 0.05.ltoreq.z.ltoreq.0.2, x+y+z=1, 0.299.ltoreq.t.ltoreq.0.589, 0.41.ltoreq.u.ltoreq.0.7, 0.001.ltoreq.v.ltoreq.0.1 and t+u+v=1), in which the ratio of silicon atoms bonded to carbon atoms in the surface layer is at least 50% of the total number of silicon atoms, and the ratio of silicon atoms bonded to oxygen atoms is 10 to 30 atomic % of the total number of silicon atoms.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: February 8, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tetsuya Takei, Shigeru Shirai, Hirokazu Ohtoshi, Ryuji Okamura, Yasuyoshi Takai, Hiroyuki Katagiri
  • Patent number: 5232507
    Abstract: An apparatus for forming deposited films with a microwave plasma CVD method comprises a reactor vessel within which the pressure can be reduced, means for supplying a source gas into the reactor vessel, means for introducing the microwave into the reactor vessel and exciting a microwave discharge plasma, and means for holding a plurality of substrates so as to enclose a discharge space formed within the reactor vessel, and is characterized by comprising a holding member holding together dielectric windows for introducing the microwave into the reactor vessel, substrates for the formation of deposited films disposed so as to surround the dielectric windows and a cooling device for cooling the dielectric windows, and conveying means for conveying the holding member into and out of the reactor vessel in a vacuum atmosphere.
    Type: Grant
    Filed: April 30, 1992
    Date of Patent: August 3, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirokazu Ohtoshi, Tetsuya Takei, Ryuji Okamura, Yasuyoshi Takai
  • Patent number: 4766091
    Abstract: A method for producing an electronic device having a multi-layer structure comprising one or more controlled band gap semiconductor thin layers formed on a substrate comprises forming at least one of said controlled band gap semiconductor thin layers according to the photo CVD method and forming at least one of the other constituent layers according to the method comprising introducing a gaseous starting material for film formation and a gaseous halogenic oxidizing agent having the property of oxidizing said starting material into a reaction space to effect chemical contact therebetween to thereby form a plurality of precursors including a precursor in an excited state and transferring at least one of these precursors into a film forming space communicated with the reaction space as a feed source for the constituent element of the deposited film.
    Type: Grant
    Filed: December 24, 1986
    Date of Patent: August 23, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirokazu Ohtoshi, Junichi Hanna, Isamu Shimizu
  • Patent number: 4735822
    Abstract: A method for producing an electronic device having a multi-layer structure comprising one or more valence electron controlled semiconductor thin layers formed on a substrate, comprises forming at least one of said valence electron controlled semiconductor thin layers according to the photo CVD method and forming at least one of other constituent layers according to the method comprising introducing a gaseous starting material for film formation and a gaseous halogenic oxidizing agent having the property of oxidizing said starting material into a reaction space to effect chemical contact therebetween to thereby form a plurality of precursors including a precursor in an excited state and transferring at least one of these precursors into a film forming space communicated with the reaction space as a feed source for the constituent element of the deposited film.
    Type: Grant
    Filed: December 24, 1986
    Date of Patent: April 5, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirokazu Ohtoshi, Masaaki Hirooka, Junichi Hanna, Isamu Shimizu