Patents by Inventor Carl C. Hiller

Carl C. Hiller 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).

  • Fast recovery circuit for heat pump water heater
    Patent number: 5495551
    Abstract: An external circuit that works in conjunction with the existing tank thermostatic controls to control both a water heating heat pump and the existing resistance elements in a water heater. The existing resistance elements are disabled to allow the heat pump to heat the water unless a large volume of hot water is quickly withdrawn whereupon the upper resistance element is re-enabled to heat the water for a faster recovery rate.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: February 27, 1996
    Assignee: Electric Power Research Institute, Inc.
    Inventors: Glen P. Robinson, Jr., Carl C. Hiller
  • Spiral flighted double walled heat exchanger
    Patent number: 5238058
    Abstract: A heat transfer coil and method of manufacture where a second piece of tubing is wound around a first piece of tubing while the first piece is straight, where the first piece of tubing is then formed to define the overall coil shape, and then the first and second pieces of tubing internally sized by internal pressurization to also force the two pieces of tubing into intimate contact with each other.
    Type: Grant
    Filed: March 18, 1991
    Date of Patent: August 24, 1993
    Inventors: Douglas M. Bodrey, Carl C. Hiller, Andrew L. Blackshaw, Glen P. Robinson, Jr.