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. 27, 2003
Filed:
Dec. 05, 2001
Der-Rong Shyn, Putz, TW;
Chih-Ching Chen, Taipei, TW;
Benq Corporation, Taoyuan, TW;
Abstract
A pressure-compensation device for adjusting the backpressure inside the cartridge of an ink jet printer includes an accumulator bag, a resilient element, and a motion element. The accumulator bag, installed inside the cartridge, communicates with the external atmosphere through an air duct. The resilient element, kept at a tension state, has a first end connected with the accumulator bag and a second end connected with the motion element. The resilient element restrains the inflation of the accumulator bag so as to induce a backpressure inside the cartridge. The accumulator bag, gradually inflating along with consumption of the ink inside the cartridge, can move the resilient element and the motion element downwards to keep the resilient element at a stable tension state, and thereby a stable backpressure inside the cartridge can be provided.