Patents by Inventor Manfred Sondermann

Manfred Sondermann 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).

  • Cordless telephone set with secure communication protocol
    Patent number: 5448764
    Abstract: In cordless telephone sets comprising at least one base station and at least one handset, an exchange of identification codes takes place between the base station and the handset. In order to realise greater flexibility with cordless telephone sets, the invention proposes to establish a connection between the handset and the base station also by means of a second identification code stored in the base station. In this manner, any user without knowing the identification codes to be exchanged between the handset and the base station can sign on and sign off a handset at any compatible base station, provided that he knows the second identification code.
    Type: Grant
    Filed: October 10, 1993
    Date of Patent: September 5, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Manfred Sondermann, Erwin Kosmann, Georg Ranner