Patents by Inventor Detlev Kramer

Detlev Kramer 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 carrying out a keyless access authorization check and keyless access authorization check device
    Patent number: 6803851
    Abstract: A method and device for checking keyless vehicle access authorization of an operator. The method includes transmitting a code signal from a base station to a mobile identification (ID) transmitter carried by the operator. In response to receiving the code signal, the ID transmitter performs an action which is indicative of a reply signal that is detectable by the base station. The difference of a signal characteristic between a reference code signal monitored at the base station and the reply signal received by the base station is then determined. The signal characteristic correlates with signal propagation time and changes as a function of the distance between the base station and the ID transmitter. The distance between the base station and the ID transmitter is then determined on the basis of a relative determination based on the difference of the signal characteristic between the reference code signal and the reply signal.
    Type: Grant
    Filed: April 12, 2001
    Date of Patent: October 12, 2004
    Assignee: Leopold Kostal GmbH & Co. KG
    Inventors: Detlev Kramer, Volker Pretzlaff, Rainer Vens, Paul Vogels, Michael Fromm, Dirk Wolf, Peter Raab