Patents by Inventor H. D. Kreft

H. D. Kreft has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Chip card
    Patent number: 5206495
    Abstract: A chip card capable of selectively transmitting data via contacts or transmission coils. The card includes a switching element device, preferably a multiplexer, coupled between a semiconductor device and contacts in a contact field and transmission coils. A voltage transmitted via the coils can be operative to automatically set the multiplexer for transmission via the coils.
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: April 27, 1993
    Assignee: Angewandte Digital Elektronik GmbH
    Inventor: H. D. Kreft