Patents Assigned to Walt R. Philipanko
  • Disposable air filter
    Patent number: 4340402
    Abstract: A dual filter system for heaters and airconditioners comprising releaseably securable throwaway secondary filter secured to a disposeable or permanent primary filter.
    Type: Grant
    Filed: October 14, 1980
    Date of Patent: July 20, 1982
    Assignee: Walt R. Philipanko
    Inventor: George W. Catron