Patents by Inventor Semion Perlin

Semion Perlin 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: 4534527
    Abstract: An improved railroad stub switch is described in which the axial rail tension or compression forces due to temperature fluctuations are transmitted through the switch by means of radius arms connected to both the switch and fixed rails, thereby eliminating the need for expensive expansion joints at the switch. In a preferred embodiment, interlocking point shoes are also employed so as to hold the butt ends in vertical and horizontal register and transmit a signal to the trailing side rail of the impending approach of a load from the approach side rail, thereby reducing batter on the trailing side rail.
    Type: Grant
    Filed: January 30, 1984
    Date of Patent: August 13, 1985
    Assignee: Canadian Patents & Development Limited
    Inventors: Lawrence A. J. van Eyken, Semion Perlin