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:
Aug. 02, 2011
Filed:
Feb. 25, 2008
Applicants:
Hans-joachim Lunk, Towanda, PA (US);
Henry J. Stevens, Athens, PA (US);
Inventors:
Hans-Joachim Lunk, Towanda, PA (US);
Henry J. Stevens, Athens, PA (US);
Assignee:
Global Tungsten & Powders Corp., Towanda, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F 9/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
There is described a method of making a nanocrystalline tungsten powder that comprises: (a) heating a tungsten-containing material in a reducing atmosphere at an intermediate temperature of from about 600° C. to about 700° C. for an intermediate time period; the tungsten-containing material being selected from ammonium paratungstate, ammonium metatungstate or a tungsten oxide; and (b) increasing the temperature to a final temperature of about 800° C. to about 1000° C. for a final time period.