Patents Represented by Attorney Donald R. Sjostrom
  • Patent number: D257756
    Type: Grant
    Filed: March 13, 1979
    Date of Patent: January 6, 1981
    Inventor: Logan W. Johnson
  • Patent number: D258088
    Type: Grant
    Filed: November 6, 1978
    Date of Patent: January 27, 1981
    Inventor: Harold D. Koch