Patents by Inventor Arne David Lindstrom

Arne David Lindstrom 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).

  • Patent number: 4056684
    Abstract: A surveillance system comprises a central unit connected, by the intermediary of a communication channel, to a plurality of local terminal units in order to receive information from these units concerning changes of status in sensors connected to the terminal units. Each terminal unit comprises a transfer blocking register with a memory cell for each sensor in at least one group of the sensors connected to the terminal unit. These memory cells have two states and are switchable between these states by control information transferred from the central unit. Moreover, a sensing device is provided for achieving, on a change of status in any one of the sensors of the group, transfer of information on such change to the central unit only when the corresponding memory cell in the transfer blocking register is in one of its two states.
    Type: Grant
    Filed: November 25, 1975
    Date of Patent: November 1, 1977
    Assignee: Saab-Scania AB
    Inventor: Arne David Lindstrom