Andrew Freeman

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For other people named Andrew Freeman, see Andrew Freeman (disambiguation).

Andrew Freeman (10 March 1909 - 17 January 1996), was the inventor of the electric block heater for automobiles.

Freeman first developed a block heater around 1947, and received U.S. Patent #2487326 on 8 November 1949.[1]

He was born in Upham, North Dakota, and attended the University of North Dakota in Grand Forks, North Dakota, where he majored in electrical engineering. He was president of Five Star Manufacturing, the company that made the original block heater, and co-founded and managed Minnkota Power Cooperative from 1940 to 1982. He died in Grand Forks.


  1. ^ US patent 2487326, A. L. Freeman, "Electric Internal-Combustion Engine Head Bolt Heater", issued 1949-11-08