US Patent 7072855 Systems and methods for purchasing, invoicing and distributing items

A method for supplying items to dispensing units that hold at least one type of item and a record of inventory levels comprises periodically sending restocking information from the dispensing units over a network to a server computer. Ordering information is generated for the items to be restocked based on the restocking information. The ordering information is electronically sent to one or more supplier computers to order items to be restocked into the dispensing units.