Patents by Inventor John P. Hartmann

John P. Hartmann 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).

  • Underground secondary containment and vapor recovery piping system
    Patent number: 5301721
    Abstract: The underground secondary containment and simultaneous vapor return piping system is adapted for use at a fuel service station which includes a fuel dispenser, a fuel nozzle and nozzle vapor return structure at a dispensing island, an underground fuel storage tank and a primary fuel delivery pipeline.
    Type: Grant
    Filed: April 8, 1993
    Date of Patent: April 12, 1994
    Inventor: John P. Hartmann