Patents Assigned to John W. Spirk
  • Patent number: D331997
    Type: Grant
    Filed: November 7, 1990
    Date of Patent: December 22, 1992
    Assignees: John R. Nottingham, John W. Spirk
    Inventors: John R. Nottingham, John W. Spirk, Jeffrey S. Plantz
  • Patent number: D332169
    Type: Grant
    Filed: November 7, 1990
    Date of Patent: December 29, 1992
    Assignees: John R. Nottingham, John W. Spirk
    Inventors: John R. Nottingham, John W. Spirk, Jeffrey S. Plantz