Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Reexamination Certificate
1999-11-23
2002-11-05
Brase, Sandra (Department: 2852)
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
C399S027000
Reexamination Certificate
active
06476837
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to apparatus and method for detecting a remaining amount of developer.
2. Related Background Art
In electrophotographic image forming apparatuses using an electrophotographic image forming process, the following methods have been used for detecting a remaining amount of developer in a developing device as developing means.
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patent: 5204698 (1993-04-01), LeSueur et al.
patent: 5530527 (1996-06-01), Fukasawa et al.
patent: 5724627 (1998-03-01), Okuno et al.
patent: 5794094 (1998-08-01), Boockholdt et al.
patent: 5937225 (1999-08-01), Samuels
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