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:
Feb. 04, 2003
Filed:
Nov. 21, 2001
Der-Rong Shyn, Putz, TW;
Chen Chih-Ching, Taipei, TW;
Acer Communications & Multimedia Inc., Taoyuan, TW;
Abstract
A pressure-compensation cartridge for ink jet printers, which is able to adjust the backpressure inside the cartridge within a proper range to prevent ink leakage from the print head or failure caused by ink dropping problems. The cartridge is a sealed container with an air duct on the top and a print head on the bottom. The pressure-compensation device, located inside the cartridge, includes an ink bag, a tension spring, and a motion element. The ink bag accommodates a substantial amount of ink for the print function of the print head and is made of a soft material. The tension spring has a first end engaged with the upper end of the ink bag and a second end engaged with the motion element. The resilience of the tension spring restrains the contraction of the ink bag caused by the running off of the ink so as to maintain a stable backpressure inside the ink bag, which prevents ink leakage or ink dropping problems through the print head of the cartridge.