Patents by Inventor Leonard G. Smith

Leonard G. Smith 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).

  • Packing gland leak retriever device
    Patent number: 4017214
    Abstract: Disclosed is a leak retriever for the packing gland on oil well pumps. The leak retriever has a reservoir disposed about the packing gland to collect oil which leaks through the gland and an auxiliary pump which is mounted in the reservoir and connected to pump all oil collected back into the discharge line for the well. The auxiliary pump is mounted in the reservoir so that any leaks from the auxiliary pump are also collected by the reservoir, and is driven by a plate on the polish rod of the well pump driving apparatus. In the first form the reservoir is clamped onto the packing gland housing below the cap nut, and in the second form it is made integral with the cap nut.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: April 12, 1977
    Inventor: Leonard G. Smith
  • Inflatable pillow
    Patent number: D394978
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: June 9, 1998
    Inventor: Leonard G. Smith