Patents by Inventor Hironobu Ishiguro

Hironobu Ishiguro 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).

  • Transmitter having automatic power controller
    Patent number: 5404586
    Abstract: A transmitter having an automatic power controller (APC). The APC switches the output power of the transmitter in a plurality of steps by gain control. The APC selects a desired one of a plurality of mutually independent variable voltage sources in accordance with an external command to obtain the offset voltage. The offset voltage is used for the gain control. The APC also can finely adjust the voltage output from the variable voltage sources in accordance with the external command independently of the other variable voltage sources.
    Type: Grant
    Filed: September 29, 1992
    Date of Patent: April 4, 1995
    Assignee: Fujitsu Ltd.
    Inventor: Hironobu Ishiguro