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:
Jul. 16, 2002
Filed:
Apr. 26, 1999
Soya Endo, Mishima, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an image forming apparatus in which a photosensitive drum has the form of a cartridge, a non-volatile memory is provided on the cartridge and a cumulative number of times image forming has been performed is stored in the non-volatile memory, a write-in-progress flag is set in the memory before a data set is written to the memory of the cartridge, and the write-in-progress flag is reset after writing of a data set to the memory ends. A plurality of identical data sets are written to the memory. If, when data sets are read out of the memory, there is a data set for which the write-in-progress flag is still in the set state, it is judged that the write operation for this data set ended in mid-course and, hence, the content of this data set is rewritten to the content of another valid data set.