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:
May. 25, 2010
Filed:
Sep. 27, 2006
Takahisa Hirasawa, Fujisawa, JP;
Kazumasa Kawasaki, Fujisawa, JP;
Manabu Shindo, Chigasaki, JP;
Tomohiro Nakamura, Machida, JP;
Hiroshi Chikuma, Matsudo, JP;
Takahisa Hirasawa, Fujisawa, JP;
Kazumasa Kawasaki, Fujisawa, JP;
Manabu Shindo, Chigasaki, JP;
Tomohiro Nakamura, Machida, JP;
Hiroshi Chikuma, Matsudo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An air-compressing apparatus has four compressors individually supplying compressed air to a tank having a pressure sensor. The pressure sensor is connected to control circuits of the compressors. The control circuits compute times needed for the tank pressure to reach minimum and maximum pressures, respectively, of the tank by using the detected tank pressure and also using a tank pressure change value. The computed time values correspond to the consumption of compressed air. Thus, the control circuits can control the number of compressors to be operated according to the consumption of compressed air.