Timothy L Stephenson

US Patent:

8048369, Nov 1, 2011

Filed:

Sep 5, 2003

Appl. No.:

10/656918

Inventors:

Robin M. Forbes Jones - Charlotte NC, US
Henry E. Lippard - Monroe NC, US
Timothy A. Stephenson - Waxhaw NC, US
Robert J. Myers - Fort Wayne IN, US
David J. Bradley - Fort Wayne IN, US

Assignee:

ATI Properties, Inc. - Albany OR

International Classification:

C22C 30/00

US Classification:

420588, 148442

Abstract:

A cobalt-nickel-chromium-molybdenum alloy useful in surgical implant applications includes, in weight percent based on total alloy weight, at least 20 cobalt, 33. 0 to 37. 0 nickel, 19. 0 to 21. 0 chromium, 9. 0 to 10. 5 molybdenum, and less than 30 ppm nitrogen. Embodiments of the alloy lack significant levels of titanium nitride and mixed carbonitride inclusions. The alloy may be cold drawn to thin-gauge wire without damage to the die as may be caused by hard particle inclusions in certain conventional alloy formulations.