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:
Oct. 03, 2000
Filed:
Sep. 30, 1997
Leon Estrowitz, Springfield, VA (US);
Charles Marquardt, Great Falls, VA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A method for producing divalent scandium includes heating, at a mildly elted temperature above 20.degree. C. under reduced pressure, a calcium difluoride crystal sample doped with scandium trifluoride to drive off atmospheric impurities, heating at an intermediate temperature above 150.degree. C. calcium metal under reduced pressure to drive off volatile impurities, heating calcium metal at a migrating below 900.degree. C. to evaporate calcium and to deposit it on the sample, and heating the sample at a diffusion and reaction temperature below 950.degree. C. to diffuse calcium into the sample and to cause formation of the divalent scandium.