William J. Zerull

Person

  • Edina, MN, US

Patents Grantslast 30 patents

  • Information Patent Grant

    Free piston engine control system

    • Patent number 5,287,827
    • Issue date Feb 22, 1994
    • Tectonics Companies, Inc.
    • Allen D. Almendinger
    • F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS