Patents by Inventor Shimpei SAKAI

Shimpei SAKAI 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).

  • Semiconductor circuit and constant voltage regulator employing same
    Patent number: 8525580
    Abstract: A semiconductor circuit includes a voltage regulator and a buffer transistor. The voltage regulator converts an input voltage input to an input terminal thereof into an output voltage output to an output terminal thereof. The buffer transistor is an n-channel depletion-mode metal-oxide semiconductor field effect transistor, disposed between the power supply terminal and the voltage regulator with a gate terminal thereof connected to the power supply terminal, a drain terminal thereof connected to the power supply terminal, and a source terminal thereof connected to the input terminal of the voltage regulator.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: September 3, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Koichi Morino, Yuki Kashima, Masatoshi Ito, Shimpei Sakai
  • SEMICONDUCTOR CIRCUIT AND CONSTANT VOLTAGE REGULATOR EMPLOYING SAME
    Publication number: 20120013396
    Abstract: A semiconductor circuit includes a voltage regulator and a buffer transistor. The voltage regulator converts an input voltage input to an input terminal thereof into an output voltage output to an output terminal thereof. The buffer transistor is an n-channel depletion-mode metal-oxide semiconductor field effect transistor, disposed between the power supply terminal and the voltage regulator with a gate terminal thereof connected to the power supply terminal, a drain terminal thereof connected to the power supply terminal, and a source terminal thereof connected to the input terminal of the voltage regulator.
    Type: Application
    Filed: June 30, 2011
    Publication date: January 19, 2012
    Applicant: RICOH COMPANY, LTD.
    Inventors: Koichi MORINO, Yuki KASHIMA, Masatoshi ITO, Shimpei SAKAI