The CardBook® cardholder is covered by one or more of the
following U. S. patents: 

No. 5,595,401; No. 5,800,659; No. 6,110,551; and No. 5,913,539.
Patents in other countries are issued and pending.  The CardBook® cardholder is a registered under U.S. Trademark No. 2,102,115.