LEHTO, JOHN M.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5066325 Cogeneration process for production of energy and iron materials, including steelExpiredFeb 24, 89Nov 19, 91[C21B]
5064174 Apparatus for production of energy and iron materials, including steelExpiredFeb 08, 88Nov 12, 91[F27B]
5055131 Cogeneration process for production of energy and iron materialsExpiredOct 16, 89Oct 08, 91[C21B]
5045112 Cogeneration process for production of energy and iron materials, including steelExpiredAug 22, 88Sep 03, 91[C21B]

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