Inventor
RITCHIE MARK D
US5 patents
⚠️ This page may combine multiple inventors who share the name “RITCHIE MARK D”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
WILLIAMS ELECTRONICS GAMES INC
4 patentsUS5322283AJun 21, 1994
Rotary ball receptacle for a pinball game
WILLIAMS ELECTRONICS GAMES INC150 citations97
US5405144AApr 11, 1995
Tilting play feature for a pinball game
WILLIAMS ELECTRONICS GAMES INC116 citations95
US5149093ASep 22, 1992
Amusement device with trading card dispenser
WILLIAMS ELECTRONICS GAMES INC52 citations93
US5137278AAug 11, 1992
Amusement device with trading card dispenser
WILLIAMS ELECTRONICS GAMES INC66 citations93