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| US5219172 | 9 Oct 1991 | 15 Jun 1993 | No Peek 21 | Playing card marks and card mark sensor for blackjack |
| US5224712 | 10 Abr 1992 | 6 Jul 1993 | No Peek 21 | Card mark sensor and methods for blackjack |
| US5312104 | 31 May 1991 | 17 May 1994 | Tech Art, Inc. | Card reader for blackjack table |
| US5362053 | 27 Jul 1993 | 8 Nov 1994 | Tech Art, Inc. | Card reader for blackjack table |
| US5364106 | 4 Nov 1992 | 15 Nov 1994 | No Peek 21 | Card mark sensor and methods for blackjack |
| US5681039 | 4 Nov 1994 | 28 Oct 1997 | Tech Art, Inc. | Card reader for blackjack table |
| US7694968 | 17 Ene 2007 | 13 Abr 2010 | | Playing card viewer |
