Patents by Inventor Marvin O. Koskela

Marvin O. Koskela 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).

  • Solar water heating system and heat exchanger for use with existing hot water systems
    Patent number: 4562828
    Abstract: In a solar water system including a solar collector, a small independent heat exchanger having three of the four ports located at the top with two ports being coaxial is provided for use with existing hot water heaters. The exchanger includes automatic drainback during freezing conditions.
    Type: Grant
    Filed: January 4, 1982
    Date of Patent: January 7, 1986
    Inventor: Marvin O. Koskela
  • Solar water heating system and heat exchanger therefor
    Patent number: 4326499
    Abstract: In a solar water system including a solar collector prevention of damage to the collector during freezing conditions is achieved by providing a relatively small independent heat exchanger between the solar collector and the water heater and a vacuum breaking system whereby the water in the solar collector is drained into the heat exchanger. The heat exchanger is connected to a thermal siphon arrangement with the water heater.
    Type: Grant
    Filed: December 26, 1979
    Date of Patent: April 27, 1982
    Inventor: Marvin O. Koskela