Patents by Inventor ROLF SIEFEL

ROLF SIEFEL 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).

  • METHOD FOR THE ACCEPTANCE OF CALLING CHARGES FOR INDIVIDUAL CALLS AS WELL AS TELEPHONE NETWORK AND TERMINAL UNIT
    Publication number: 20010043688
    Abstract: In a method to accept call charges by the calling subscriber (A) for individual calls over a telephone network (1), following an agreement on the allocation of the charges between two subscribers, the calling subscriber (A) sends a caller-specific signal as binding confirmation of this agreement, whereupon the calling subscriber (B) accepts the call. The caller-specific signal can be stored in the form of a digital code on a smart card (9).
    Type: Application
    Filed: May 13, 1999
    Publication date: November 22, 2001
    Inventors: ROLAND SAWATZKI, ROLF SIEFEL