Patents by Inventor Raphael Koelsch

Raphael Koelsch 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).

  • Arrangement for determining the number of persons and a direction within a space to be monitored or a pass-through
    Patent number: 4847485
    Abstract: In an installation for determining the number of persons inside a monitored room or so-called pass-through, a sensor field is generated by IR-sensors. An evaluation unit uses as discriminating criterion the detection of moving bodies and generates for an entrance control unit a signal, allowing or barring the entrance of a person.
    Type: Grant
    Filed: April 21, 1988
    Date of Patent: July 11, 1989
    Inventor: Raphael Koelsch