06439993 is referenced by 376 patents.

A method and apparatus concerning the operation of gaming machines is provided. The method generally comprises providing a gaming machine having a plurality of simulated spinning reels capable of displaying a wild card symbol at any of the reels. According to the present invention, upon the appearance of a first wild card symbol, additional wild card symbols may appear, providing the player with additional opportunities to win a prize, or to win an additional prize. The apparatus of the present invention is directed to a gaming machine capable of displaying simulated spinning reels having a plurality of symbols, and capable of displaying a wild card symbol. If a first wild card symbol has been displayed, the apparatus then displays an additional one or more wild card symbols, providing the player with an additional opportunity to win a prize, or to win an additional prize. The present invention is particularly well-suited to increasing player interest in a gaming machine by increasing the ways in which playing the game may result in the award of a prize.

Title
Operation of gaming machines with addition of wild card symbols
Application Number
9/496240
Publication Number
6439993 (B1)
Application Date
February 1, 2000
Publication Date
August 27, 2002
Inventor
Terence Matthew O&apos Halloran
Edgecliff
US
Agent
Seyfarth Shaw
US
George H Gerstman
US
Assignee
I G T
US
IPC
A63F 13/10
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