Patents by Inventor Marcel J. G. Vrijkorte

Marcel J. G. Vrijkorte 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).

  • Paging system with paging receivers controlled depending on location
    Patent number: 4943803
    Abstract: Paging system comprising a call transmitter, at least one portable paging receiver and a control transmission system with a control transmitter to which a number of transmission loops are connected encompassing essentially adjacent zones. The call transmitter is capable of transmitting a call transmission signal comprising a call address code. On receipt of a cell address code which corresponds to a call address code stored in the paging receiver, the receiver can generate a signal for the user of the receiver by means of a signalling member. The control transmission system is capable of transmitting by means of the loops a control transmission signal comprising a control command. On receipt of a control command by the receiver, the receiver can go into and remain in a state corresponding to the control command, in particular on or off.
    Type: Grant
    Filed: November 30, 1988
    Date of Patent: July 24, 1990
    Assignee: Ericsson Paging Systems B.V.
    Inventor: Marcel J. G. Vrijkorte