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:
Jun. 14, 1977
Filed:
Oct. 20, 1975
Klaus Andres, Berkeley Heights, NJ (US);
Paul Herman Schmidt, Chatham, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
As a cryogenic refrigerant in an adiabatic demagnetization refrigerator, the intermetallic compound PrNi.sub.5 has been used to reach the millidegree Kelvin temperature range. The compound has a relatively large cooling entropy in this range and the specific heat peak, characteristic of materials of this class, occurs well below one millidegree. The material is easily solderable and is incorporated into a 'cooling pill' by soldering to the metal wires or foils needed for producing thermal contact to the material to be refrigerated. The use of oriented crystals with their hexagonal axes perpendicular to the applied magnetic field is particularly advantageous. Suitable single phase PrNi.sub.5 bodies have been produced by annealing bulk melted samples, by Czochralski growth and by an extrusion method.