Patents by Inventor Edward J. Callhan

Edward J. Callhan 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: 4737049
    Abstract: A roadway reflector device to be embedded in a roadway but with the reflector element thereof projecting partly above the roadway surface, to be seen by oncoming motorists and used as a guide. The reflector element is elongated and of circular shape, in cross-section. When the reflector element, located in a roadway so that its lengthwise direction lies in a direction transverse to the direction of travel, is impacted by a horizontally directed force, that force causes the reflector element to rotate, and when impacted by a vertically downward force is pushed downwardly into the housing for the device against a compressible means, which on removal of the downwardly directed force returns to its original vertical location. Thus, the potentially damaging effects of these impacting forces is nullified, leaving the reflective device undamaged.
    Type: Grant
    Filed: December 29, 1986
    Date of Patent: April 12, 1988
    Inventor: Edward J. Callhan