Patents Represented by Law Firm Steves, Davis, Miller & Mosher
  • Nickel-metal hydride secondary battery comprising a compound silicate
    Patent number: 6461767
    Abstract: A nickel-metal hydride secondary battery includes positive electrodes including nickel hydroxide, negative electrodes including a hydrogen-absorbing alloy, separators and an alkaline electrolyte. The positive electrode includes a compound silicate. By employing the above construction, the compound silicate reacts with Mn or Al which dissolves out from the negative electrode to inhibit deterioration of electrochemical characteristics of the battery, and thus the life of the battery can be prolonged.
    Type: Grant
    Filed: June 21, 2000
    Date of Patent: October 8, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshitaka Dansui, Tatsuhiko Suzuki, Hideki Kasahara, Takeshi Yao
  • Process for producing semipermeable membranes
    Patent number: 4265959
    Abstract: A method for the preparation of semipermeable membranes which comprises sulfonating porous membranes of acrylonitrile polymers containing acrylonitrile in an amount of 40% to 100% by mole.The resulting semipermeable membrane is very useful for separating substances by reverse osmosis or ultrafiltration.
    Type: Grant
    Filed: December 27, 1978
    Date of Patent: May 5, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Takezo Sano, Takatoshi Shimomura, Ichiki Murase, Manabu Hirakawa