Patents by Inventor Ian T. Simpson

Ian T. Simpson 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).

  • Microwave barrier
    Patent number: 4752778
    Abstract: The invention relates to a microwave barrier which uses at least two aerial beams of which one forms a protected zone extending down to the ground while the other is inclined upwards relative to the horizontal. In this way by the use of a simple construction intruders can be prevented both from crawling under the barrier and jumping over it.
    Type: Grant
    Filed: October 31, 1984
    Date of Patent: June 21, 1988
    Assignee: Hormann Sicherheitstechnik GmbH
    Inventor: Ian T. Simpson