Patents by Inventor David M. Lawson

David M. Lawson 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).

  • On-site automated closed loop petroleum based hydrocarbon fluid filtration and recycling system
    Patent number: 5702607
    Abstract: An on-site automated closed loop petroleum based hydrocarbon fluid filtration and recycling system that continuously recycles a spent petroleum based hydrocarbon fluid and simultaneously continuously dispenses the recycled petroleum based hydrocarbon fluid.
    Type: Grant
    Filed: July 8, 1996
    Date of Patent: December 30, 1997
    Inventor: David M. Lawson