Patents by Inventor George C. Johnstone

George C. Johnstone 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).

  • Methods for simultaneously brazing a ferrule and lead pins
    Patent number: 9138821
    Abstract: A lead pin fixture is used to align and hold lead pins in place for brazing lead pins to metal contact pads of a ceramic insulator and brazing a ferrule to the ceramic insulator in a single step.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: September 22, 2015
    Assignee: Medtronic, Inc.
    Inventors: William M. Brosnan, Rajesh V. Iyer, George C. Johnstone, Susan A. Tettemer, Andrew J. Thom
  • METHODS FOR SIMULTANEOUSLY BRAZING A FERRULE AND LEAD PINS
    Publication number: 20150202706
    Abstract: A lead pin fixture is used to align and hold lead pins in place for brazing lead pins to metal contact pads of a ceramic insulator and brazing a ferrule to the ceramic insulator in a single step.
    Type: Application
    Filed: April 24, 2014
    Publication date: July 23, 2015
    Applicant: Medtronic, Inc.
    Inventors: William M. Brosnan, Rajesh V. Iyer, George C. Johnstone, Susan A. Tettemer, Andrew J. Thom
  • Implantable medical device with biocompatible surface and method for its manufacture
    Patent number: 5980973
    Abstract: A method of providing biocompatible surface texturing on a metal component of an implantable device and the device so produced. The coating is provided by applying particles of metal falling substantially entirely in the range of 1 to 5 microns to a surface of said component to provide a layer of generally uniform thickness and sintering said particles to one another and to said component to provide a generally continuous external surface having surface texturing in the form of projections formed from said sintered particles. The particles are preferably applied to a depth of 1 to 25 microns. In a preferred embodiment particles of titanium are applied to a surface of a titanium component.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: November 9, 1999
    Assignee: Medtronic, Inc.
    Inventors: Chike O. Onyekaba, George C. Johnstone, David D. Verness