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. 29, 2002
Filed:
Aug. 07, 2001
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The outermost surface protection layer of the heater of an ink-jet recording head containing at least metal or oxide thereof is protected against erosion by suppressing or preventing the dissolution of the outermost surface protection layer. The heater is adapted to apply thermal energy to a liquid composition to be ejected. The liquid composition contains a liquid medium, alkali metal ions and a compound expressed by general formula H N—(CHY) —(CH ) —X, X representing a carboxyl group or a sulfonic acid group, Y representing a hydrogen atom, a carboxyl group or a sulfonic acid group, n representing 0 or 1, m representing an integer from 0 to 2. The liquid composition is heated so as to satisfy the relation as defined by the formula 1.10≦E /E ≦1.90, E representing the amount of energy applied to the heater per unit time in order to cause the recording head to eject the liquid composition, E representing the minimum amount of energy required by the recording head per unit time to eject ink.