David Freriks and Len Czuba
U.S. Patent #7,152,600 issued December 26, 2006
Keith D’Alessio, Gary Prokop, Len Czuba, Carl Behrend and Peter Kopec
U.S. Patent #6,960,040 issued November 1, 2005
Keith D’Alessio, Gary Prokop, Len Czuba, Carl Behrend, Peter Kopec, Upvan Narang, Gabriel Szabo, Anthony Voiers and Cheryl Kennedy
U.S. Patent #6,802,416 issued Oct. 12, 2004
Keith D’Alessio, Gary Prokop, Len Czuba, Carl Behrend, and Peter Kopec
U.S. Patent #6,372,313 issued April 16, 2002
Len Czuba, R. Daniel Webster et al
U.S. Patent #5,071,686 issued December 10, 1991
Len Czuba, Dean Laurin, Paul Measells, Bill Johnston, and Peter Kwong
U.S. Patent #5,066,290 issued November 19, 1991
Len Czuba, Dean Laurin and Bill Johnston
U.S. Patent #4,892,604 issued January 9, 1990
Len Czuba, R. Daniel Webster et al
U.S. Patent #4,778,697 issued October 18, 1988
Len Czuba, Bill Johnston, and R. Daniel Webster et al
U.S. Patent #4,692,361 issued September 8, 1987
Len Czuba, Bill Johnston, and R. Daniel Webster et al
U.S. Patent #4,686,125 issued August 11, 1987
Len Czuba and Dean Laurin
U.S. Patent #4,391,029 issued July 5, 1983
Dave Bacehowski, Harold Bowerman, Len Czuba, and Peter Kwong
U.S. Patent #4,299,256 issued November 10, 1981
Dean Laurin, Len Czuba, and Larry Becker
U.S. Patent #4,266,542 issued May 12, 1981
Dean Laurin, Len Czuba, and Larry Becker
U.S. Patent #4,196,731 issued April 8, 1980
Dean Laurin, Hank Gajewski, Len Czuba and Paul Measells
U.S. Patent #4,140,162 issued Feb. 20, 1979