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:
Nov. 07, 2017
Filed:
Jan. 21, 2010
Shyam S. Bayya, Ashburn, VA (US);
Woohong Kim, Lorton, VA (US);
Jasbinder S. Sanghera, Ashburn, VA (US);
Guillermo R. Villalobos, Springfield, VA (US);
Ishwar D. Aggarwal, Fairfax Station, VA (US);
Shyam S. Bayya, Ashburn, VA (US);
Woohong Kim, Lorton, VA (US);
Jasbinder S. Sanghera, Ashburn, VA (US);
Guillermo R. Villalobos, Springfield, VA (US);
Ishwar D. Aggarwal, Fairfax Station, VA (US);
The United States of America, as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A method of preparing a fine powder of calcium lanthanoid sulfide is disclosed. The method includes spraying soluble calcium and lanthanoid salts into at least one precipitating solution to form a precipitate comprising insoluble calcium and lanthanoid salts, optionally, oxidizing the precipitate comprising insoluble calcium and lanthanoid salts, and sulfurizing the optionally oxidized precipitate to form a fine powder of calcium lanthanoid sulfide. An alternative method for forming the powder is by flame pyrolysis. The calcium lanthanoid sulfide powder produced by either method can have an impurity concentration of less than 100 ppm, a carbon concentration of less than 200 ppm, a BET surface area of at least 50 m/g, and an average particle size of less than 100 nm.