Patents Assigned to Product Innovation Limited
  • Movement sensor
    Patent number: 4688025
    Abstract: A movement sensor having a movable part, detection means for providing a first detection signal when the part is in one position and a second detection signal when the part is in a different position, and means for producing an alarm signal in response to the first and second detection signals being successively provided after initiation of the operation of the sensor irrespective of the order in which said signals are provided.
    Type: Grant
    Filed: November 5, 1984
    Date of Patent: August 18, 1987
    Assignee: Product Innovation Limited
    Inventor: Peter Frank