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:
Dec. 10, 2019
Filed:
Mar. 10, 2017
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Masatoshi Sakurai, Abiko, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
An exhaust gas purification system for a construction machine prevents deterioration of an aqueous urea solution remaining in a conduit of an aqueous urea solution replenishing circuit after replenishment. An aqueous urea solution return circuit returns, to an aqueous urea solution tank, an excessive aqueous urea solution that has not been injected from an aqueous urea solution injection device into the exhaust gas, and is provided with a first return conduit that connects the aqueous urea solution injection device to the aqueous urea solution tank and a second return conduit that connects the aqueous urea solution injection device to a conduit of an aqueous urea solution replenishing circuit. An injection valve opening pressure of a first check valve provided in the first return conduit is set higher than an injection valve opening pressure of a second check valve provided in the second return conduit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile