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. 14, 2006
Filed:
Apr. 02, 2002
Koichi Shibata, Ibaraki, JP;
Kiyoshi Ono, Tokyo, JP;
Genroku Sugiyama, Ibaraki, JP;
Osamu Tomikawa, Tokyo, JP;
Hiroyuki Adachi, Ibaraki, JP;
Hideo Karasawa, Ibaraki, JP;
Toichi Hirata, Ibaraki, JP;
Hiroshi Watanabe, Ibaraki, JP;
Koichi Shibata, Ibaraki, JP;
Kiyoshi Ono, Tokyo, JP;
Genroku Sugiyama, Ibaraki, JP;
Osamu Tomikawa, Tokyo, JP;
Hiroyuki Adachi, Ibaraki, JP;
Hideo Karasawa, Ibaraki, JP;
Toichi Hirata, Ibaraki, JP;
Hiroshi Watanabe, Ibaraki, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A security system for a construction machine including a construction machine equipped with a body controller for storing a first password, management apparatus arranged in a location apart from the construction machine and a portable communications unit for storing a second password provided communicably with the management apparatus and the body controller. The portable communications unit, receiving the first password from the management apparatus, replaces the second password with the first password. The body controller determines whether the second password output from the portable communications unit coincides with the first password. In case these passwords coincide with each other, an engine drive signal is output. Otherwise the engine is kept inoperable. This prevents possible theft of a construction machine.