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:
Sep. 22, 1992
Filed:
Feb. 12, 1988
Applicant:
Inventors:
Nicholas D Spencer, Washington, DC (US);
Wie H Pan, Columbia, MD (US);
John Rudesill, Baltimore, MD (US);
Assignee:
W. R. Grace & Co. -Conn., New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; C01F / ;
U.S. Cl.
CPC ...
505-1 ; 505738 ; 505780 ; 505785 ;
Abstract
Superior homogeneity in ceramic materials is achieved by reacting certain soluble metal salts with quaternary ammonium carbonates to form co-precipitated metal carbonates. The precipitate can be recovered and processed to make superconductors. For example, a solution of nitrates of yttrium, barium, and copper are treated with a solution of tetraethyl ammonium carbonate to form co-precipitated carbonates of Y, Ba, Cu. The precipitate is recovered and calcined to form a superconducting material.