Patents by Inventor Isamu Hayama

Isamu Hayama 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).

  • Access gateway and method of operation by the same
    Patent number: 8817775
    Abstract: An access gateway containing IP telephone service functions for subscribers under an integrated access device (IAD), forming a PSTN network side speech path or IP network side speech path selectively for each subscriber, and, further automatically switching, when trouble occurs at the IP network side, the IP network side speech path to the PSTN network side speech path.
    Type: Grant
    Filed: March 2, 2010
    Date of Patent: August 26, 2014
    Assignee: Fujitsu Limited
    Inventor: Isamu Hayama
  • ACCESS GATEWAY AND METHOD OF OPERATION BY THE SAME
    Publication number: 20100157993
    Abstract: An access gateway containing IP telephone service functions for subscribers under an integrated access device (IAD), forming a PSTN network side speech path or IP network side speech path selectively for each subscriber, and, further automatically switching, when trouble occurs at the IP network side, the IP network side speech path to the PSTN network side speech path.
    Type: Application
    Filed: March 2, 2010
    Publication date: June 24, 2010
    Applicant: FUJITSU LIMITED
    Inventor: Isamu Hayama