Ink cartridge including a unit to sense a remaining amount...

Details Ink cartridge including a unit to sense a remaining amount... Ink cartridge including a unit to sense a remaining amount...

2006-05-25

2009-06-16

Huffman, Julian D (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

Reexamination Certificate

active

07547082

ABSTRACT:
An ink cartridge includes a residual ink sensing unit having a simple structure of an upper electrode plate and a lower electrode plate to accurately detect a capacitance between the upper and lower electrode plate. Therefore, data of a remaining amount of ink is reliably measured, there is less possibility that an ink bag is damaged when the residual ink sensing unit is installed in the ink bag, and damage to the ink cartridge and defective printing due to unstable supply of ink and the missing of the time for replacing the ink cartridge are prevented.

REFERENCES:
patent: 4604633 (1986-08-01), Kimura et al.
patent: 6474156 (2002-11-01), Endo et al.
patent: 6513891 (2003-02-01), Eida
patent: 6641240 (2003-11-01), Hsu et al.
patent: 1 125 748 (2001-08-01), None
patent: 2001-121681 (2001-05-01), None
patent: 2002-127443 (2002-05-01), None
patent: 10-2004-0007201 (2004-01-01), None

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