Patents by Inventor Michimasa Matsukawa

Michimasa Matsukawa 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).

  • Process of removing platinum inclusions from laser glass
    Patent number: 4919699
    Abstract: A process of removing platinum inclusions from laser glass is disclosed, comprising bubbling the laser glass in a molten state with PCl.sub.3 or POCl.sub.3.
    Type: Grant
    Filed: July 21, 1988
    Date of Patent: April 24, 1990
    Assignee: Hoya Corporation
    Inventors: Michimasa Matsukawa, Tetsuro Izumitani, Kunio Takeuchi
  • Silicophosphate laser glass
    Patent number: 4820662
    Abstract: A silicophosphate laser glass having a composition comprising, in % by mole,45 to 70% P.sub.2 O.sub.5 ;5 to 20% SiO.sub.2 ;60 to 95% P.sub.2 O.sub.5 +SiO.sub.2 +Al.sub.2 O.sub.5 ;10%<Al.sub.2 O.sub.3 .ltoreq.20%;20%<(Al.sub.2 O.sub.3 +SiO.sub.2).ltoreq.30%;4 to 30% Li.sub.2 O+Na.sub.2 O+K.sub.2 O;0.01 to 12% Nd.sub.2 O.sub.3 ;0 to 5% La.sub.2 O.sub.3 +Y.sub.2 O.sub.3 +B.sub.2 O.sub.5 ;0 to 10% R'O; and0 to 1% Nb.sub.2 O.sub.5 +CeO.sub.2,wherein R' is Mg, Ca, Sr, Ba, Zn or Pb. The silicophosphate laser glass can construct an excellent laser glass as an amplifying medium.
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: April 11, 1989
    Assignee: Hoya Corporation
    Inventors: Tetsuro Izumitani, Michimasa Matsukawa, Chiemi Hata