Patents by Inventor Hansjurg Keller

Hansjurg Keller 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).

  • Infrared intrusion detector circuit
    Patent number: 4179691
    Abstract: A circuit for an infrared intrusion detector comprising a plurality of receiving directions or regions which are separated from one another and a radiation receiver, at the output of which there appears an electrical signal corresponding to the infrared radiation which is absorbed by all of the receiving directions or regions. The circuit is structured such that an alarm signal is delivered when the received infrared radiation both ascends in a predetermined manner as well as descends in a predetermined manner within a given delay time.
    Type: Grant
    Filed: July 22, 1977
    Date of Patent: December 18, 1979
    Assignee: Cerberus AG
    Inventor: Hansjurg Keller
  • Radiation detector and method of operating the same
    Patent number: 4166955
    Abstract: A radiation detector having at least one radiation sensitive element with more than two electrical contacts. The effects of noise occurring between pairs of contacts are substantially eliminated by multiplying at least two partial signals appearing between two of the contacts. The detector is particularly suitable for use as a passive infrared detector and as a flame detector.
    Type: Grant
    Filed: March 30, 1978
    Date of Patent: September 4, 1979
    Assignee: Cerberus AG
    Inventor: Hansjurg Keller
  • Infrared radiation-burglary detector
    Patent number: 4087688
    Abstract: An infrared radiation-burglary detector comprising an optical system for focusing the radiation upon a radiation receiver. One or more internally reflecting prism surfaces enclose the axis of the optical system and are arranged substantially parallel to such axis.
    Type: Grant
    Filed: November 4, 1976
    Date of Patent: May 2, 1978
    Assignee: Cerberus AG
    Inventor: Hansjurg Keller
  • Infrared radiation-burglary detector
    Patent number: 4081680
    Abstract: An infrared radiation-burglary detector comprising a number of reflector surfaces which focus the radiation incident from different separate receiving regions upon a common radiation receiver. The reflector surfaces are arranged and aligned such that the intersection locations of the receiving regions, viewed in the radiation direction, are located behind the front of the detector.
    Type: Grant
    Filed: November 4, 1976
    Date of Patent: March 28, 1978
    Assignee: Cerberus AG
    Inventor: Hansjurg Keller
  • Radiation detector
    Patent number: 4058726
    Abstract: A radiation detector for simultaneously detecting electromagnetic radiation from a number of separate receiving regions by means of a single radiation receiver. Optical bundling means are arranged such that they direct the radiation emanating from the individual receiving regions onto the single radiation receiver. The optical bundling means comprise surfaces having two different main radii of curvature. The radiation receiver is arranged at the one main focal point of the individual surfaces.
    Type: Grant
    Filed: July 22, 1976
    Date of Patent: November 15, 1977
    Assignee: Cerberus AG, Switzerland
    Inventors: Hansjoachim Paschedag, Hansjurg Keller
  • Infrared radiation-burglary detector
    Patent number: 4052616
    Abstract: An infrared radiation-burglary detector comprising radiation-focusing means and a radiation receiver. A bunch of radiation-conducting elements is provided, the radiation inlet openings of which are arranged at the focal surface of the radiation-focusing means and the radiation outlets of which are arranged in front of the radiation receiver.
    Type: Grant
    Filed: November 4, 1976
    Date of Patent: October 4, 1977
    Assignee: Cerberus AG
    Inventor: Hansjurg Keller