David E. Johnson, Jr.

Person

  • Indianapolis, IN, US

Patents Grantslast 30 patents

  • Information Patent Grant

    Hydronic heating system

    • Patent number 7,658,335
    • Issue date Feb 9, 2010
    • Thermodynamic Process Control, LLC
    • David E. Johnson, Jr.
    • F24 - HEATING RANGES VENTILATING