Patents by Inventor Kenji Shitara

Kenji Shitara 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: 4833702
    Abstract: In a wide area cordless telephone system, a wide service area is divided into a plurality of local service areas identified respectively by unique codes. Each local area has home position portable cordless telephones to which telephone numbers are permanently assigned and can accommodate roaming non-home position telephones belonging to other local areas. Each telephone receives a pre-registration polling signal from one of access units located at key points and returns a pre-registration response signal if a unique code contained in the received polling signal mismatches a stored area code. A controller in each local area assigns a reserved telephone number, if available, to a roaming telephone in response to such a response signal and registers this cordless telephone in memory. The controller then transmits an acknowledgement signal indicating the completion of a registration. The registered telephone responds to it by returning a post-registration signal which is monitored by the controller.
    Type: Grant
    Filed: May 13, 1988
    Date of Patent: May 23, 1989
    Assignees: NEC Corporation, Nippon Telephone and Telegraph Corporation
    Inventors: Kenji Shitara, Akio Sasaki, Yoshitoshi Murata