Patents by Inventor Sekiji Yokota

Sekiji Yokota 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).

  • Water proofing compositions for cement mortar or concrete
    Patent number: 4338224
    Abstract: Water proofing compositions containing a reclaimed butyl rubber of used inner tube scraps as the active component have a high adhesion to cement mortar or concrete and are used for water proofing materials in buildings and civil engineering works.
    Type: Grant
    Filed: March 31, 1981
    Date of Patent: July 6, 1982
    Assignee: Hayakawa Rubber Co., Ltd.
    Inventors: Toshihiro Fujii, Sekiji Yokota
  • Water proofing compositions for cement mortar or concrete and method employing same
    Patent number: 4193831
    Abstract: Water proofing compositions containing a reclaimed butyl rubber of used inner tube scraps as the active component have a high adhesion to cement mortar or concrete and are used for water proofing materials in buildings and civil engineering works.
    Type: Grant
    Filed: October 27, 1977
    Date of Patent: March 18, 1980
    Assignee: Hayakawa Rubber Company Limited
    Inventors: Toshihiro Fujii, Sekiji Yokota
  • Water proofing compositions for cement mortar or concrete and methods of application therefor
    Patent number: 4174992
    Abstract: Water proofing compositions containing a Reclaimed butyl rubber of used inner tube scraps as the active component have a high adhesion to cement mortar or concrete and are used for water proofing materials in buildings and civil engineering works.
    Type: Grant
    Filed: July 27, 1978
    Date of Patent: November 20, 1979
    Assignee: Hayakawa Rubber Company Limited
    Inventors: Toshihiro Fujii, Sekiji Yokota
  • Water proofing compositions for cement mortar or concrete and methods of application therefor
    Patent number: 4174993
    Abstract: Water proofing compositions containing a Reclaimed butyl rubber of used inner tube scraps as the active component have a high adhesion to cement mortar or concrete and are used for water proofing materials in buildings and civil engineering works.
    Type: Grant
    Filed: July 27, 1978
    Date of Patent: November 20, 1979
    Assignee: Hayakawa Rubber Company Limited
    Inventors: Toshihiro Fujii, Sekiji Yokota