Patent Assignment
Reel/Frame 017815/0604
Assignment of Assignor's Interest
Recorded: 2006-04-21
Pages: 3
Assignor
O'CALLAHAN, DENNIS M.
Executed: 2006-04-21
Assignee
CHICAGO BOARD OPTIONS EXCHANGE, INCORPORATED
400 S. LASALLE STREET, CHICAGO, ILLINOIS, 60605
Covered Property
(1)
Method and System for Creating and Trading Corporate Debt Security Derivative Investment Instruments
Related Assignments
(2)
Other recorded transfers of the patent in this record — the chain of ownership.