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:
Jan. 23, 2007
Filed:
Mar. 12, 2004
Toshiro Hattori, Tokyo, JP;
Katsuyuki Takahashi, Tokyo, JP;
Kiyoshi Tanaka, Tokyo, JP;
Akira Matsui, Tokyo, JP;
Yoshiyuki Kobayashi, Tokyo, JP;
Harumi Sato, Tokyo, JP;
Toshiro Hattori, Tokyo, JP;
Katsuyuki Takahashi, Tokyo, JP;
Kiyoshi Tanaka, Tokyo, JP;
Akira Matsui, Tokyo, JP;
Yoshiyuki Kobayashi, Tokyo, JP;
Harumi Sato, Tokyo, JP;
Mayekawa Mfg. Co., Ltd., Tokyo, JP;
Abstract
A screw compressor is equipped with a manually operated internal volume ratio adjusting slide valve and capacity adjusting slide valve. The compressor is simple in construction, can be produced with low cost, can accommodate decrease in suction pressure, for example, in an aged gas well, and can be operated without an electric power source for controlling the operation thereof. Also a combined screw compressor unit consisting of a plurality of screw compressors for producing high discharge pressure is provided which can accommodate high suction pressure in order not to overload the higher pressure compressor or compressors with the efficiency of the unit kept as high as possible by including at least a screw compressor according to the present invention in the unit.