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:
Jan. 09, 2006
Hans-joachim Lunk, Towanda, PA (US);
Ricky D. Morgan, Milan, PA (US);
Henry J. Stevens, Athens, PA (US);
Dale E. Benjamin, Athens, PA (US);
Tuan A. Dang, Sayre, PA (US);
Timothy A. Frisk, Towanda, PA (US);
Hans-Joachim Lunk, Towanda, PA (US);
Ricky D. Morgan, Milan, PA (US);
Henry J. Stevens, Athens, PA (US);
Dale E. Benjamin, Athens, PA (US);
Tuan A. Dang, Sayre, PA (US);
Timothy A. Frisk, Towanda, PA (US);
Global Tungsten & Powders Corp., Towanda, PA (US);
Abstract
The coating the tungsten powder particles with a ceramic barrier suppresses the leachability of tungsten in aqueous media. Preferably, the ceramic coating substantially encapsulates each particle of tungsten and has a thickness of at least about 30 nm and, more preferable, from about 200 nm to about 500 nm. Examples of ceramic coatings that may be used include, but are not limited to, aluminum oxide (alumina), aluminum oxyhydroxide (AlOOH), zirconium oxide (zirconia), cerium oxide (ceria), hafnium oxide (hafnia), and magnesium oxide (magnesia).