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. 24, 1996
Filed:
Feb. 14, 1994
Yutaka Hirano, Ohta, JP;
Takeo Komatubara, Kiryu, JP;
Takashi Sunaga, Ohra-gun, JP;
Yasuki Takahashi, Sawa-gun, JP;
Kiyoshi Tanaka, Ohra-gun, JP;
Kiyoshi Akazawa, Ohra-gun, JP;
Masato Watanabe, Ohra-gun, JP;
Seiki Jikuhara, Akoh, JP;
Sanyo Electric Co., Ltd., Osaka-fu, JP;
Abstract
A lubricant for a refrigerating unit uses a hydrofluorocarbon system refrigerant with a polyol ester system oil as its base oil. The purity of hydrofluorocarbon system refrigerant is set to a level higher than 99.95 wt % and the mixing of chlorine impurity in the system refrigerant is set at a level lower than 80 ppm. The performance and reliability of a refrigerating unit using the hydrofluorocarbon system refrigerant, such as R134a, can be enhanced by making the polyol ester system oil of a chemical compound having particular physical properties, by suppressing the equilibrium water content of refrigeration cycle and by limiting the residual volume.