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:
May. 20, 2014
Filed:
Jan. 19, 2011
Kensuke Sato, Tsuchiura, JP;
Hiroyuki Azuma, Tsuchiura, JP;
Tsuyoshi Nakamura, Tsuchiura, JP;
Yasuo Okano, Tsuchiura, JP;
Kouji Ishikawa, Tsuchiura, JP;
Mitsuhiko Kanehama, Tsuchiura, JP;
Kensuke Sato, Tsuchiura, JP;
Hiroyuki Azuma, Tsuchiura, JP;
Tsuyoshi Nakamura, Tsuchiura, JP;
Yasuo Okano, Tsuchiura, JP;
Kouji Ishikawa, Tsuchiura, JP;
Mitsuhiko Kanehama, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A hydraulic drive device for a construction machine includes an engine stopping unit and a discharge rate control unit. The engine stopping unit stops the engine when a predetermined state of the construction machine has continued for a predetermined period of time. The discharge rate control unit controls a discharge rate control pressure being input to the regulator, when an exhaust emission control device performs regeneration control, or performs warm-up control, and the gate lock lever is in the open position.