The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 30, 2002
Filed:
Dec. 06, 1994
Gerald J. Julien, Puyallup, WA (US);
Nitinol Technologies, Inc., Edgewood, WA (US);
Abstract
A Nitinol element is threaded by first heating it to a temperature of about 800° C., and then applying a threading tool, such as a tap or die, to form the threads. Nitinol has a unique property of increasing yield strength as cold work is applied, but this property ceases to exist above a temperature of about 800° C. The strength of the material at this temperature, however, is sufficient to resist the torque applied by a threading die being screwed onto a Nitinol blank even though it is low enough to permit the Nitinol to flow when the cutting threads of the threading die are forced into the material. At this temperature, the Nitinol is not actually cut by the cutting threads of the tap, die or other threading tool, but instead, the material flows around the cutting threads to form threads in the Nitinol. Since the metal flows into spaces between the threads of the “cutting” or forming tool, it is necessary to use slightly undersized rod or slightly oversized holes when using conventional dies and taps since no chips are removed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile