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:
Sep. 02, 2003
Filed:
Oct. 18, 2001
Yasunao Otomo, Shizuoka, JP;
Takashi Hibi, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a developer container, there are provided a flat antenna for measuring the predetermined range of the developer-remaining-amount, and a plate antenna for measuring the predetermined amount or less of the developer-remaining-amount. When the detected value by the flat antenna is a predetermined value or greater, the minimum detected voltage value of the plate antenna is measured, and this value is stored as PAF (plate antenna full) in the storing means of a cartridge. During the measurement of the predetermined value or less of the developer by the plate antenna, the detected voltage value is calculation-processed and corrected by PAF to thereby obtain the developer amount.