Patents by Inventor Ryoji Fujiwara

Ryoji Fujiwara 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: 5260817
    Abstract: A liquid crystal optical device has a ferroelectric liquid crystal layer held in a gap defined by at least a pair of electrodes, wherein the crystal pixel has a time constant. The liquid crystal device also has a parallel circuit having a time constant greater than the time constant of the liquid crystal pixel and less than a field period for giving a gradation change to the pixel by repeated application of a gradation signal.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: November 9, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shuzo Kaneko, Ryoji Fujiwara, Tomoko Maruyama, Murakami Tomoko
  • Patent number: 5148302
    Abstract: An optical modulation element characterized in that a two-dimensional phase type diffraction gratings, whose refractive index changes for each predetermined period along two different directions in a predetermined plane, is adopted, and a changing state of the refractive index is controlled to change characteristics of the diffraction grating, so that a diffraction phenomenon of light incident on the element is controlled.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: September 15, 1992
    Inventors: Akihiko Nagano, Etsuro Kishi, Ryoji Fujiwara, Yukitoshi Ohkubo, Michiyo Nishimura, Hajime Sakata, Takayuki Ishii, Masato Yamanobe
  • Patent number: 4902109
    Abstract: An electrochromic device employing a metal oxide film as an oxidative-coloration layer is provided. The metal oxide film is a porous film comprising grains, 50% in number or more of which have a grain size of 1000 to 5000 .ANG. in diameter, and changes its optical density in a range of 0.3 to 0.65 between a bleached state and a colored state. The metal oxide film is prepared by an anodic oxidation process in which alternating potential is continuously applied to a metallic film initially with a smaller amplitude and subsequently with a larger amplitude.
    Type: Grant
    Filed: April 29, 1987
    Date of Patent: February 20, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shinichi Kawate, Ryoji Fujiwara, Etsuro Kishi
  • Patent number: 4892594
    Abstract: A photovoltaic element comprises a p-type layer comprising a p-type transition metal oxide, an active layer comprising an amorphous silicon, a n-type layer comprising an amorphous silicon containing a n-type impurity, and an electrode.
    Type: Grant
    Filed: October 5, 1988
    Date of Patent: January 9, 1990
    Assignees: Canon Kabushiki Kaisha, Kanegafuchi Chemical Industry Co., Ltd.
    Inventors: Ryoji Fujiwara, Minori Yamaguchi, Isamu Shimizu
  • Patent number: 4850681
    Abstract: An optical modulation device for effecting optical modulation by controlling the diffraction phenomenon of light, which not only consumes a small amouhnt of the driving energy employed, such as a electric power, but which is also capable of improvements in reliability.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: July 25, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masao Yamanobe, Yasuyuki Watanabe, Hajime Sakata, Yukitoshi Ohkubo, Tomoyuki Umezawa, Chiori Mochizuki, Kazuya Ishiwata, Takayuki Ishii, Akihiko Nagano, Etsuro Kishi, Ryoji Fujiwara
  • Patent number: 4670334
    Abstract: A transparent electroconductive film is of p-type and mainly composed of iridium oxide. The p-type transparent electroconductive film can be produced by a reactive sputtering or reactive ion plating at room temperature. The p-type transparent electroconductive film can be used as electrodes.
    Type: Grant
    Filed: October 11, 1984
    Date of Patent: June 2, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryoji Fujiwara, Isamu Shimizu
  • Patent number: 4605285
    Abstract: An electrochromic device comprises an oxidative-coloration layer between a pair of electrodes, said oxidative-coloration layer being composed of a film of a metal oxyhydroxide represented by the formula:MOx(OH)ywherein M is a metal of group VIII of the periodic table, x is a number satisfying 0<x<1, and y is a number satisfying 1<y<2.
    Type: Grant
    Filed: March 26, 1984
    Date of Patent: August 12, 1986
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryoji Fujiwara, Isamu Shimizu
  • Patent number: 4438972
    Abstract: An operating mechanism for operating a sliding and tilting roof panel includes an electric motor driving the panel through a cable. A rack and a pinion are arranged so that the rack will be pushed by the cable and the pinion will be rotated by the rack. A switch operating member engages with the pinion so as to be moved according to the rotation of the pinion. Additionally, first and second limit switches are operated by the switch operating member. The first limit switch is operated to cut off the actuation of the motor when the roof is slid to its fully closed position, and the second limit switch is operated to cut off the actuation of the motor when the roof is tilted to its fully closed position, so that the roof is automatically stopped at its fully closed position when the roof is slid or tilted. The first and second limit switches are so arranged that just when the first limit switch starts to be operated the second limit switch takes a position just short of operation.
    Type: Grant
    Filed: April 28, 1981
    Date of Patent: March 27, 1984
    Assignees: Nissan Motor Company, Limited, Johnan Seisakusho Company, Limited
    Inventors: Yoshinori Katayama, Ryoji Fujiwara, Tsunetoshi Nishimaki