Patents by Inventor Sandeep Rajnikant Shah

Sandeep Rajnikant Shah 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 for repair welding aluminum-lithium alloys
    Patent number: 6003755
    Abstract: Aluminum-lithium alloy sheets which are welded together are examined to identify regions requiring repair. A grid is applied to the sheet about the region requiring repair, and the region to be repaired is ground out and rewelded. Residual stresses are relieved by planishing yes to cause localized plastic deformation in the repaired region. The grid is used as a guide to restoring the original dimensions of the sheet in a manner which tends to reduce in-plane shrinkage. The reduced in-plane shrinkage in turn tends to reduce undesired tensile residual stresses. The planishing also tends to work-harden the weld filler.
    Type: Grant
    Filed: February 20, 1997
    Date of Patent: December 21, 1999
    Assignee: Lockheed Martin Corp.
    Inventors: Sandeep Rajnikant Shah, Lynda Louise Johnston, Julian Ervin Bynum, Samuel Dwight Clark, Benny Floyd Graham, Ronald Brian Renfroe, Patrick Ryan Rogers