Patents by Inventor Derwin C. Spencer

Derwin C. Spencer 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: 7137162
    Abstract: A method of identifying the position of an opening, for example a door or a cargo bay, or the like of an aircraft, said opening having a predetermined perimeter, said method comprising: i) providing at least one passive target means (10, 11) proximate the perimeter of said opening and preferably being disposed proximate the perimeter of said opening, and when said opening is a door proximate the four corners of said door, and in another embodiment said target means is provided as a cluster of targets for example, at least one target located proximate each corner of said door; ii) directing a preferably pulsing lighting means (30) on said target (10, 11), preferably a passive reflective target such as that manufactured by the 3M company under the trademark Scotchlite® in one embodiment being in the invisible spectrum such as infrared or the like; iii) providing a target identification means and preferably at least one camera (20) and preferably a digital camera synchronized with said lighting means (30) and pr
    Type: Grant
    Filed: February 26, 2003
    Date of Patent: November 21, 2006
    Assignee: Indal Technologies Inc.
    Inventors: Derwin C. Spencer, Ohad I. Unna