Patents by Inventor Leo Parth

Leo Parth 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: 4834398
    Abstract: A pipe gasket is shown for use in forming a joint made up of an outer pipe having an annular groove therein for receiving the gasket and an inner pipe inserted within the outer pipe. The gasket includes a body formed from a resilient material having an interior and an exterior. The interior of the body includes a first portion formed of a hard, relatively high durometer material which is initially contacted by the inner pipe and a second portion formed of a relatively lower durometer, more flexible material. The second portion includes an inwardly extending projection which forms a primary sealing surface with respect to the inner pipe when the inner and outer pipes are assembled. Because the entry region initially contacted by the inner pipe is formed of a higher durometer material, the gasket tends to securely maintain its position within the outer pipe groove during the installation of the inner pipe.
    Type: Grant
    Filed: August 31, 1987
    Date of Patent: May 30, 1989
    Assignee: S & B Technical Products, Inc.
    Inventors: Samuel Guzowski, Leo Parth