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:
Jul. 28, 1992
Filed:
Mar. 11, 1991
Robert A Ackermann, Schenectady, NY (US);
John L Walter, Ballston Lake, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Materials for cryogenic refrigerator regenerators are formed by a high yield spark erosion cell. The materials are made of erbium or dysprosium and are spherical shaped. The spheres have a diameter range of 150 .mu.m to 400 .mu.m with a packing factor of at least 50%. The materials are made by disposing chunks of a starting material into a liquid dielectric in a spark chamber, agitating the chunks, impressing a spark voltage in order to cause melting of the chunks and formation of spherical particles, and collecting the particles at the bottom of the spark chamber. The particles may then be gathered, dried, and separated.