Patents by Inventor John P. Kerr

John P. Kerr 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).

  • Method and apparatus for reducing axial thrust in centrifugal pumps
    Patent number: 5320482
    Abstract: A control stator comprising a plurality of stationary vanes, ribs, or cavities is provided in a centrifugal pump having a shrouded impeller. The function of the control stator is to slow the swirl of fluid in the cavity between the casing and the impeller front shroud and thereby provide a very cost effective solution to the problem of excess axial thrust. The control stator is a simple, inexpensive non-rotating part that can be affixed in an existing space in the pump casing between the casing wall and the front shroud of the impeller.
    Type: Grant
    Filed: September 21, 1992
    Date of Patent: June 14, 1994
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Alan S. Palmer, John W. Henry, IV, John P. Kerr
  • Unmanned remotely piloted aircraft
    Patent number: 4478379
    Abstract: An unmanned aircraft of the remotely piloted type that is characterized by its configuration and outline using rigid counter rotating propellers, positioned substantially at the height of its center of mass or slightly below to allow producing a sufficiently large control moment to use a tether line for landing the aircraft and to allow using two substantially spheroidal surfaces at the top and bottom respectively rather than a single one relatively larger and more detectable surface as when the propellers are at the top.
    Type: Grant
    Filed: October 27, 1983
    Date of Patent: October 23, 1984
    Assignee: Canadair Limited
    Inventor: John P. Kerr
  • Display for an electronic device
    Patent number: D1023009
    Type: Grant
    Filed: May 10, 2022
    Date of Patent: April 16, 2024
    Assignee: Apple Inc.
    Inventors: Jody Akana, Molly Anderson, Bartley K. Andre, Shota Aoyagi, Anthony Michael Ashcroft, John J. Baker, Marine C. Bataille, Jeremy Bataillou, Abidur Rahman Chowdhury, Clara Geneviève Marine Courtaigne, Markus Diebel, Richard Hung Minh Dinh, Christopher E. Glazowski, Jonathan Gomez Garcia, Jean-Pierre S. Guillou, M. Evans Hankey, Matthew David Hill, Julian Hoenig, Richard P. Howarth, Jonathan P. Ive, Julian Jaede, Duncan Robert Kerr, Peter Russell-Clarke, Benjamin Andrew Shaffer, Sung-Ho Tan, Clement Tissandier, Eugene Antony Whang, Rico Zörkendörfer