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:
Jan. 13, 2026
Filed:
Mar. 07, 2023
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Akira Kurasako, Tsuchiura, JP;
Hideki Akita, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A management apparatus and a management system for a work machine capable of increasing the accuracy in determining whether or not oil of a driving apparatus of the work machine is replaced with genuine oil are provided. A management server manages oil used in the driving apparatus of a hydraulic excavator. The management server includes an oil replacement history creation section that acquires a measurement value of a property of target oil from an oil sensor incorporated in the hydraulic excavator and is configured to create a replacement history of the target oil on the basis of a change of the property of the target oil, a worker access history creation section that acquires access information indicating that the hydraulic excavator is accessed by a worker, the worker access history creation section being configured to create a history of access to the hydraulic excavator by the worker on the basis of the access information, and an oil type determination section that is configured to determine an oil type of the target oil replaced in a replacement timing corresponding to the replacement history, on the basis of the replacement history of the target oil and the access history of the worker.