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. 07, 2020
Filed:
Mar. 25, 2015
Phc Holdings Corporation, Tokyo, JP;
Susumu Kobayashi, Gunma, JP;
Hiroyuki Satou, Saitama, JP;
PHC HOLDINGS CORPORATION, Tokyo, JP;
Abstract
An ultralow binary refrigeration apparatus, which cools an enclosed space to an ultralow temperature of −80° C. or lower to be used for storing cells or microorganisms, for example, without posing worries in regard of Ozone Depletion Potential (ODP) and Global Warming Potential (GWP), and which is excellent in refrigerant stability, can dispense with an oil separator, and enables a reduction in the amount of refrigerant, or a reduction in the power output of the compressor. The object is achieved by a binary refrigeration apparatus configured by connecting a high temperature refrigeration cycle and a low temperature refrigeration cycle via a cascade condenser, in which the high temperature refrigeration cycle is filled with propane as a refrigerant and a refrigerator oil, while the low temperature refrigeration cycle is filled with a hydrocarbon having a boiling point of −80° C. or lower as a refrigerant, a refrigerator oil, and an oil return agent.