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:
Dec. 25, 2007
Filed:
Apr. 08, 2005
Masanobu Oomura, Kanagawa-ken, JP;
Masanobu Oomura, Kanagawa-ken, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A head cartridge has a print head which discharges ink, and an ink tank which contains ink which is supplied to the print head. A sensor which detects residual ink amount in the ink tank is provided in the ink tank. The print head includes a detection circuit which detects the presence of residual ink amount using the sensor, a judgment circuit which judges the presence of residual ink amount on the basis of an output from the detection circuit and outputs ink zero information when judging that there is no residual ink amount, and nonvolatile memory which stores ink zero information when the ink zero information is outputted from the judgment circuit.