Patents by Inventor Leonid G. Zeltser

Leonid G. Zeltser 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).

  • Rotary shaft sealing method and device
    Patent number: 5292137
    Abstract: A dry-face sealing method for preventing leakage around a rotary shaft uses an annular rigid seal having a smooth sealing surface and an annular resilient seal having a projecting sealing edge aligned coaxially therewith. The annular resilient seal has a breaking elongation of at least about 100 percent of its original length, the resilient seal being stretched at least about 20 percent and less than 40 percent of its breaking elongation in a direction substantially parallel to the smooth sealing surface to align polymeric resilient seal components in a direction parallel with the smooth sealing surface and smooth the sealing surface thereof. The projecting edge, because of its shape and position, functions as a stress concentrator, concentrating the stress hardening effect on the sealing surface of the projecting edge.
    Type: Grant
    Filed: December 23, 1992
    Date of Patent: March 8, 1994
    Assignee: Rotoflex, Inc.
    Inventors: Brian Simmons, Leonid G. Zeltser, Arnold Kholodenko