Patents by Inventor Richard D. Zitting

Richard D. Zitting 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).

  • Seal assembly
    Patent number: 6217030
    Abstract: A seal for acceptance in an annular gland in a piston comprises an annular primary sealing element, an annular secondary sealing element disposed radially inwardly of the primary sealing element, and a pair of axially spaced back up rings disposed in axially spaced relation on opposite sides of the primary sealing element and having radially inner portions, respectively, engaged with the primary sealing element so as to lock the backup rings in the gland of the piston.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: April 17, 2001
    Inventor: Richard D. Zitting
  • Seal assembly
    Patent number: RE42654
    Abstract: A seal for acceptance in an annular gland in a piston comprises an annular primary sealing element, an annular secondary sealing element disposed radially inwardly of the primary sealing element, and a pair of axially spaced back up rings disposed in axially spaced relation on opposite sides of the primary sealing element and having radially inner portions, respectively, engaged with the primary sealing element so as to lock the backup rings in the gland of the piston.
    Type: Grant
    Filed: April 10, 2003
    Date of Patent: August 30, 2011
    Assignee: SKF USA Inc.
    Inventor: Richard D. Zitting