Patents by Inventor Sakae Saito

Sakae Saito 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: 5773613
    Abstract: The present invention provides a tryptoanthrinimine derivative represented by the general formula (Y): ##STR1## wherein R.sup.A to R.sup.M are as defined. Such a derivative of the general formula (Y) is superior in electron transferring capability. Accordingly, an electrophotosensitive material comprising a photosensitive layer containing this derivative (Y) is superior in sensitivity.
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: June 30, 1998
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Hirofumi Kawaguchi, Nobuko Akiba, Yukimasa Watanabe, Hiroaki Iwasaki, Yasuyuki Hanatani, Yasufumi Mizuta, Fumio Sugai, Sakae Saito, Syunichi Matsumoto, Toshiyuki Fukami, Ichiro Yamazato, Hisakazu Uegaito, Yuji Tanaka
  • Patent number: 5550290
    Abstract: The present invention relates to a benzidine derivative represented by the general formula (1): ##STR1## wherein R.sup.1 to R.sup.6, m and n are as defined in the present specification. The benzidine derivative improves durability and heat resistance of a membrane containing the same while maintaining high hole transferring capability. Therefore, an electrophotosensitive material, which comprises a photosensitive layer containing the benzidine derivative, has high sensitivity and is superior in durability and heat resistance.
    Type: Grant
    Filed: September 28, 1994
    Date of Patent: August 27, 1996
    Assignee: Mita Industrial Co. Ltd.
    Inventors: Yasufumi Mizuta, Masashi Tanaka, Nariaki Muto, Toshiyuki Fukami, Hideo Nakamori, Mikio Kakui, Sakae Saito, Hiroshi Shiomi, Keisuke Sumida, Maki Uchida
  • Patent number: 5514508
    Abstract: The present invention provides an electrophotosensitive material having an improved sensitivity in comparison with a conventional one, obtained by combining a trinitrofluorenoneimine derivative represented by the formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same or different and indicate a hydrogen atom, an alkyl group, an alkoxy group, an aryl group which may contain a substituent, an aralkyl group which may contain a substituent, or a halogen atom! as an electron transferring material with a prescribed electric charge generating material or hole transferring material.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: May 7, 1996
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Toshiyuki Fukami, Hideo Nakamori, Hiroshi Shiomi, Hirofumi Kawaguchi, Hisakazu Uegaito, Nariaki Muto, Mikio Kakui, Keisuke Sumida, Sakae Saito, Maki Uchida
  • Patent number: 5505778
    Abstract: An apparatus for treating solid surface using a thermally excited molecular beam according to the present invention is capable of completely preventing flying of contaminant caused by a heating source to a sample. To achieve this, in the present invention, the heating source for exciting the molecules is hermetically separated from the sample. Alternatively, a container where the heating source is housed and a container where the sample is accommodated are separated such that a conductance between the two containers is sufficiently small. In this way, chemical reactions between the molecular beam of the reactive gas which is highly reactive and the heating source heated to high temperatures can be eliminated, and flying of the contaminant to the sample can thus be greatly reduced. As a result, flying of the contaminating substances caused by the heating source to the sample can be prevented, and reduction in the surface treating rate of the sample, caused by the contaminant, can be prevented.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: April 9, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Tetsuo Ono, Susumu Hiraoka, Sakae Saito, Kunio Harada, Mituhiro Tachibana, Shigeo Kubota, Keizo Suzuki
  • Patent number: 5494765
    Abstract: The present invention relates to a novel phenylenediamine derivative of the general formula (1): ##STR1## wherein R.sup.1 R.sup.2 R.sup.3 and R.sup.4 are selected from the group consisting of: alkyl groups, alkoxy groups, halogen atoms and aryl groups; and m, n, p and q are integers in the range of 0 to 3, andan electrophotosensitive material using the same as an electric charge transferring material.The phenylenediamine derivative is excellent in not only compatibility with binding resin but also electric charge transferring capability, particularly hole transferring capability. Therefore, a photosensitive material using the above derivative as an electric charge transferring material exhibits a higher sensitivity.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: February 27, 1996
    Assignee: Mita Industrial Co. Ltd
    Inventors: Toshiyuki Fukami, Hideo Nakamori, Keisuke Sumida, Sakae Saito
  • Patent number: 5222470
    Abstract: An ignition timing control system for an internal combustion engine of the spark ignition type such as a gasoline engine. A throttle opening of the engine is sampled and a throttle opening variation is calculated. A real volumetric efficiency is calculated based on a real intake air amount and a real engine rotational speed by a real volumetric efficiency calculating device and the real volumetric efficiency is corrected based on the throttle opening variation by a volumetric efficiency correcting device to calculate an effective volumetric efficiency. An ignition timing is set in accordance with the effective volumetric efficiency and the engine rotational speed by an ignition timing setting device and an ignition timing controlling signal is developed based on the ignition timing set by the ignition timing setting device. An igniting device operates upon reception of the ignition timing controlling signal.
    Type: Grant
    Filed: April 28, 1992
    Date of Patent: June 29, 1993
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Mitsuhiko Oonuma, Sakae Saito, Hitoshi Kamura
  • Patent number: 5011545
    Abstract: A method for manufacturing a hard-to-work alloy article comprises the steps of: preparing a laminate member comprising a plurality of layers of different metals in a stoichiometric ratio for the intended alloy composition; dividing the laminate member into pieces; combining the pieces to a body for plastic deformation; subjecting the body to plastic deformation under pressure to form an article having a given shape and dimensions; and applying a thermal diffusion treatment to the article.
    Type: Grant
    Filed: September 18, 1989
    Date of Patent: April 30, 1991
    Assignees: Nippon Stainless Steel Co., Ltd., Senri Ikeda, Sakae Saito
    Inventors: Senri Ikeda, Sakae Saito, Shuji Hanada, Hironobu Hoshi
  • Patent number: 4099348
    Abstract: A surfacing or finishing machine for precision machining of a workpiece which includes a grinding wheel or edging tool installed on a working spindle, a driving motor for rotating the working spindle, and a power transmitting system for transmitting power from the driving motor to the working spindle. The power transmitting system includes a flexible link mechanism fashioned of a number of link belts or the like interconnected in series by a number of rotatable pulleys. The driving motor and power transmitting system are so arranged with respect to the surfacing and finishing machine that the working spindle is isolated from adverse vibrations which result from the operation of the driving motor and power transmission system.
    Type: Grant
    Filed: May 27, 1977
    Date of Patent: July 11, 1978
    Assignee: Hitachi, Ltd.
    Inventors: Shigeo Kato, Sakae Saito, Osamu Morita