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:
Oct. 26, 2010
Filed:
Oct. 12, 2007
Chen-hsing Cheng, Hsinchu, TW;
Tsung-yu Hung, Hsinchu, TW;
Chen-Hsing Cheng, Hsinchu, TW;
Tsung-Yu Hung, Hsinchu, TW;
Hon Hai Precision Industry Co., Ltd., Tu-Cheng, Taipei Hsien, TW;
Abstract
The present invention relates to an apparatus () for regulating air pressure in an ink tank (). The apparatus includes a vacuum pump () configured for providing a pressure below atmospheric pressure in the ink tank. A first regulating unit (), a second regulating unit (), and a third regulating unit () are disposed between the vacuum pump and the ink tank, and in communication with each other. The first regulating unit and the third regulating unit each include a pressure regulating valve and a buffer tank connected with the pressure regulating valve, and the second regulating unit includes a closed-loop pressure regulating valve () and a buffer tank () connected with the closed-loop pressure regulating valve.