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:
Feb. 24, 2026
Filed:
Jul. 15, 2022
Fujitsu General Limited, Kanagawa, JP;
Satoshi Okumura, Kanagawa, JP;
FUJITSU GENERAL LIMITED, Kanagawa, JP;
Abstract
An air conditioner includes an outdoor unit, an indoor unit and a refrigerant circuit. The conditioner performs heating operation in which an indoor heat exchanger functions as a condenser for a refrigerant that is compressed by a compressor and an outdoor heat exchanger functions as an evaporator for a refrigerant that is condensed by the indoor heat exchanger. The conditioner includes a memory, and processing circuitry configured to estimate an amount of refrigerant that remains in the circuit by using an operating state quantity of the conditioner in the heating operation. The estimating includes a plurality of different estimation models that correspond to ranges of the amount of refrigerant that remains in the circuit. One of the estimation models uses, as the operating state quantity, a degree of supercooling of refrigerant at an outlet of the indoor heat exchanger.