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:
Aug. 09, 2011
Filed:
Jul. 20, 2007
Dong-rak Lee, Busan, KR;
Jae-woo Park, Gyeongsangnam-do, KR;
Min-ho Chin, Gyeongsangnam-do, KR;
Chang-do Huh, Busan, KR;
Dong-Rak Lee, Busan, KR;
Jae-Woo Park, Gyeongsangnam-do, KR;
Min-Ho Chin, Gyeongsangnam-do, KR;
Chang-do Huh, Busan, KR;
S & T Daewoo Co., Ltd., Busan, KR;
Abstract
The present invention relates to a cylinder which has hollow portion therein; a piston rod which is inserted through an upper side of the cylinder and has a groove pattern having plurality of convex portions and concave portions which are alternately formed; a piston valve which is connected with a lower end of the piston rod so as to be reciprocated in the cylinder and has a fluid passing hole which is formed in an up and down direction; a rod guide which closes up an upper end of the cylinder tightly and guides an up-down movement of the piston rod and which has a through-hole at a side portion thereof; and a sensor module which is installed to the rod guide so as to detect a movement of the piston rod by using a variation in magnetic field generated when the piston rod is moved.