Patents by Inventor George Maitland

George Maitland 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).

  • Down-hole tools
    Patent number: 5664629
    Abstract: A time delay mechanism wherein there is provided a time delay between the application of a pressure to the mechanism and an action being carried out as a result of the application of said pressure. The mechanism may comprise a first piston and piston chamber and a second piston and piston chamber. Communication of a viscous fluid between said piston chambers may be achieved by means of at least one contoured flow passage.
    Type: Grant
    Filed: May 18, 1995
    Date of Patent: September 9, 1997
    Assignee: Petroleum Engineering Services Limited
    Inventor: George Maitland