(a) settled by physical delivery no later than the third business day following the last business day of the contract's named month of expiration (Rule 20103.) (cannontrading.com)
Deliveries against an expiring contract can be made no earlier than the first business day of the contract's named month of expiration, and no later than the third business day following the last business day of the contract's named month of expiration (Rule 20103.). (cannontrading.com)
The contract delivery month shall be defined so as to commence on, and to include, the first business day of the contract's named month of expiration, and to extend to, and to include, the third business day following the last business day of the contract's named month of expiration. (cannontrading.com)