ISSUED PATENTS
ISSUE DATE
Excursion Limiter U.S. Patent Number: 7,274,793 Inventor: Christopher E. Combest, John Koval
September 25, 2007
Speaker Grill Frame U.S. Patent Number: 6,993,145 Inventor: Christopher E. Combest
January 31, 2006
Coaxial speaker with step-down ledge to eliminate sound wave distortions and time delay U.S. Patent Number: 6,963,650 Inventor: Christopher E. Combest
November 8, 2005
Driver control circuit U.S. Patent Number: 6,707,919 Inventor: Christopher E. Combest, John Koval
March 16, 2004
