Patents by Inventor A. Davis Johnson

A. Davis Johnson 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).

  • Thin-film shape memory alloy device and method
    Patent number: 7981258
    Abstract: A thin film device, such as an intravascular stent, is disclosed. The device is formed of a seamless expanse of thin-film (i) formed of a sputtered nitinol shape memory alloy, defining, in an austenitic state, an open, interior volume, having a thickness between 0 5-50 microns, having an austenite finish temperature Af below 37° C.; and demonstrating a stress/strain recovery greater than 3% at 37° C. The expanse can be deformed into a substantially compacted configuration in a martensitic state, and assumes, in its austenitic state, a shape defining such open, interior volume. Also disclosed is a sputtering method for forming the device.
    Type: Grant
    Filed: January 21, 2009
    Date of Patent: July 19, 2011
    Assignees: Stryker Corporation, Stryker NV Operations Limited, Tini Alloy Company
    Inventors: A. Davis Johnson, Arani Bose, Valery V. Martynov, Vikas Gupta