Don Borchert Donald P Borchert patent 6536250 Expired
Consumer Report
Patent 6536250 is expired check US Patent office. If you get pitched to work on the Dent machine or Vacuum dent removal the patent is expired due to non-payment of fees as of May 22. Link to US Patent office, look for 6536250. Gov/web/offices/com/sol/og/week21/patexpi.htm ...