A system for providing credit card sub-accounts with varying credit limits is useful to consolidate many accounts into one account. The present invention allows a user to add others to an existing account with the safety of setting credit limits for each sub-account to prevent sub-account holders from...http://www.google.com.hk/patents/US7389912?utm_source=gb-gplus-share專利 US7389912 - Method and system for creating banking sub-accounts with varying limits
