Patents by Inventor Tomo Yamada

Tomo Yamada 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).

  • IP key management mechanism with divergence barrier increasing entropy against computational crypto-analyses
    Patent number: 6917685
    Abstract: A key generator (51, 61) generates, from an IP-key (11) for entering a closed IP network (1), a set (52, 62) of session keys (53, 63) indexed for identification, an index pointer (71, 72) points an index (i, j) to identify a session key (53, 63), the set (52, 62) of session keys has a divergence barrier incorporated therein for barring a computational approach to any session key (53, 63), and an unbar data set (i, j, 62) unbars the divergence barrier.
    Type: Grant
    Filed: February 4, 1999
    Date of Patent: July 12, 2005
    Assignee: Meteora System Co., Ltd.
    Inventors: Eiji Watanabe, Hiroshi Take, Yoshihiro Sekiguchi, Tomo Yamada, Yasuo Tojima
  • Artificial leather shoe and artificial leather suited therefor
    Patent number: 6739076
    Abstract: One embodiment of the invention relates to a laminated sheet material, including, in order: (A) a substrate layer having an inner surface and at least a partially napped outer surface and including: an entangled nonwoven first fabric including ultrafine fibers having a fineness of not more than 0.01 decitex; and a first elastomeric polymer impregnated in the first fabric; (B) an adhesive layer; and (C) a substrate layer, including: an entangled nonwoven second fabric including fibers having a fineness of not less than 0.05 decitex; and a second elastomeric polymer impregnated in the second fabric; wherein at least a portion of the napped outer surface is covered with a third polymer, the third polymer being solid at a temperature of 20-25° C. and having a melting point not lower than 60° C. and having an elongation at break of not more than 10%. Another embodiment of the present invention provides a shoe upper, that includes the above-mentioned laminated sheet material.
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: May 25, 2004
    Assignee: Kuraray Co., Ltd.
    Inventors: Hisao Yoneda, Yoshiki Nobuto, Susumu Kobayashi, Mikihiro Matsui, Tomo Yamada
  • Artificial leather shoe and artificial leather suited therefor
    Publication number: 20010024709
    Abstract: One embodiment of the invention relates to a laminated sheet material, including, in order:
    Type: Application
    Filed: January 8, 2001
    Publication date: September 27, 2001
    Applicant: Kuraray Co., Ltd.
    Inventors: Hisao Yoneda, Yoshiki Nobuto, Susumu Kobayashi, Mikihiro Matsui, Tomo Yamada