Patents by Inventor Takeo Nagata

Takeo Nagata 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: 4306460
    Abstract: A differential pressure transducer having a cantilever and a semiconductor strain gauge attached to each side of the cantilever at an intermediate portion of the latter. The cantilever has one end fixed by electron beam welding to a fixing member and the other end left for free displacement in response to a differential pressure. The displacement of the other end of the cantilever is detected as changes in the electric resistances of the semiconductor strain gauges.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: December 22, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Sakurai, Takeo Nagata, Yoshitaka Matsuoka, Satoshi Shimada, Mitsuo Ai
  • Patent number: 4292618
    Abstract: A semiconductor substrate has a major surface, another major surface on the opposite side of the first major surface, a strain gauge stripe formed in the central portion of the second major surface by diffusing an impurity therein, and electrodes connected to the strain gauge stripes. These strain gauge stripes are spaced from the peripheral edge of the second major surface by a distance greater than 1/3 of the length of the same major surface. The first major surface of the semiconductor substrate is bonded to an elastic metal load plate.
    Type: Grant
    Filed: March 11, 1980
    Date of Patent: September 29, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Masanori Tanabe, Satoshi Shimada, Akio Yasukawa, Motohisa Nishihara, Takeo Nagata
  • Patent number: 4264889
    Abstract: A pressure transducer has at least one pressure transmitting space filled with liquid, a space for a pressure to be sensed connected to the pressure transmitting space through a diaphragm, and a pressure sensitive element in the pressure transmitting space for transducing a pressure transmitted from the space for the pressure to be sensed to the pressure transmitting space through the diaphragm to an electrical signal. A printed circuit board wired to electrically connect terminals of the pressure sensitive element is arranged closely to the element and thin temperature sensitive elements for temperature-compensating the pressure sensitive element are arranged on the printed circuit board.
    Type: Grant
    Filed: January 18, 1980
    Date of Patent: April 28, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Yoshimi Yamamoto, Mitsuo Ai, Yoshitaka Matsuoka, Takeo Nagata, Tsutomu Okayama, Akira Ikegami
  • Patent number: 4180626
    Abstract: The present invention relates to a microbiological process for the production of citric acid by assimilation of olefins. Normal olefins of C.sub.8-40 produced from thermal cracking of petroleum wax or from polymerization of ethylene are suitable as carbon source for this fermentation process. Said process is carried out by culturing the microorganism selected from the group of Candida tropicalis, Candida intermedia and Candida brumptii, their mutants and their variants in the culture medium containing acid olefins. Citric acid is accumulated in said medium in the process of the culture.The most suitable strain utilized in the present invention is Candida tropicalis, their mutants and their variants.
    Type: Grant
    Filed: December 29, 1977
    Date of Patent: December 25, 1979
    Assignee: Showa Oil Co., Ltd.
    Inventors: Takeo Nagata, Seisuke Satoh, Takao Matsumoto
  • Patent number: 4166384
    Abstract: A semiconductor transducer comprising an improved strain-yielding body yielding a strain in response to the impartation of a force or displacement, and a semiconductor strain gauge bonded to the strain-yielding body. The improved strain-yielding body is made of an iron-nickel-cobalt alloy containing 28.2 to 31.0% by weight of nickel and 15.0 to 19.5% by weight of cobalt. This iron-nickel-cobalt alloy is initially heated up to a temperature above 600.degree. C. for the purpose of standard heat treatment for removing its internal strain. After the standard heat treatment, the iron-nickel-cobalt alloy is subjected to cold working at a working rate of more than and including 60%, and is then subjected to heat treatment at a temperature between 350.degree. C. and 600.degree. C. The heat-treated iron-nickel-cobalt alloy is shaped into the predetermined form of the strain-yielding body.
    Type: Grant
    Filed: September 6, 1978
    Date of Patent: September 4, 1979
    Assignee: Hitachi, Ltd.
    Inventors: Yasumasa Matsuda, Kazuji Yamada, Satoshi Shimada, Motohisa Nishihara, Tomio Yasuda, Masatoshi Tsuchiya, Ko Soeno, Mitsuo Ai, Takeo Nagata, Yoshitaka Matsuoka
  • Patent number: 3986399
    Abstract: A filled-in-fluid and diaphragm type intermediate device for transmitting pressure and for use with a pressure, liquid level or flow rate transmitter is disclosed, which enables the measurement of the pressure, liquid level or flow rate at a high temperature by using a conventional transmitter.This device includes a fluid-contacting flange having mounted thereon a pressure receiving element and coupled to a flange provided on the side of a fluid to be measured. A sealing flange having mounted thereon a diaphragm is provided on the side of a meter proper. A pressure transmitting pipe is coupled to the fluid-contacting flange and to the sealing flange, and contains therein a pressure-transmitting fluid which is adapted for use at a high temperature or as anti-radiant-ray fluid.
    Type: Grant
    Filed: December 21, 1973
    Date of Patent: October 19, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Keiichi Satou, Takeo Nagata, Yosimi Yamamoto