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:
Sep. 04, 1990
Filed:
Dec. 14, 1988
Kenichi Inoda, Hirakata, JP;
Terumaru Harada, Ikoma, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A free-piston compressor which has a cylinder, a compressor piston disposed movably in the cylinder, thereby first and second chambers being formed in the cylinder, a low pressure pipe coupled to the first chamber through which pipe, low pressure fluid flows, a high pressure pipe coupled to the first chamber through which, high pressure fluid flows, two valves coupled between the low pressure and high pressure pipes, and the second chamber, a control device for controlling the two valves in a manner that a dead point position of the compressor piston is kept at a target point, and driving means for driving the compressor piston.