Methods and credit or debit card systems are disclosed that allow the available credit to be determined by someone other than the card issuer and that allow a limit to be set on the number of expenditures that can be made. The methods and systems can be used to provide a mechanism for supervising credit...http://www.google.com/patents/US5953710?utm_source=gb-gplus-sharePatent US5953710 - Children's credit or debit card system
