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. 01, 1993
Filed:
Dec. 11, 1990
Kensaku Oguni, Shimizu, JP;
Susumu Nakayama, Shizuoka, JP;
Hiromu Yasuda, Shizuoka, JP;
Rumi Minakata, Shizuoka, JP;
Kazumoto Urata, Shizuoka, JP;
Masatoshi Muramatsu, Shimizu, JP;
Takao Senshu, Shizuoka, JP;
Kenji Tokusa, Shizuoka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A heat-pump device indicates a weight of inappropriate amount of refrigerant in a heat-pump cycle by comparing an actual amount of refrigerant in the heat-pump cycle with an appropriate amount thereof, operates in accordance with a refrigerant amount judging operational mode when the actual amount of refrigerant is measured, and includes a judging device for judging the amount of refrigerant in the heat-pump cycle on the basis of a temperature of refrigerant at a condensor side and at least one information showing an operational condition of the heat-pump cycle.