1
Juergen Dethloff, Christian Hinneberg: Multi-user card system. Juergen Dethloff, Notaro & Michalos, June 6, 1989: US04837422 (483 worldwide citation)

A card combination which is issued to a single cardholder can be reprogrammed by the cardholder for use by a sub-user to a desired extent with regard to value and time. The cardholder uses a master enabling code to access the programming mechanism. He/she assigns a sub-PIN for use by the sub-user an ...


2
Juergen Dethloff, Christian Hinneberg: Smart card issuing and receiving apparatus. Juergen Dethloff, Notaro & Michalos, November 6, 1990: US04968873 (341 worldwide citation)

An apparatus for issuing a transaction card comprises a value receiving mechanism in the form of a card reader or a bank note acceptor or both. The apparatus includes a memory for storing the exchange rate for a plurality of currencies as compared to a local visitor's voucher which can be issued by ...


3
Juergen Dethloff, Christian Hinneberg: Apparatus and method to control economical systems. Juergen Dethloff, Notaro & Michalos, May 23, 1989: US04833607 (83 worldwide citation)

The incentive and feedback apparatus includes a plurality of business stations, each having an incentive module and a transaction mechanism for conducting different types of transactions involving different types of products. The incentive module stores a plurality of indices that encode a business ...