	US 7,581,807 B2
	Liquid container and ink jet printing apparatus
Nobuyuki Hatasa, Kawasaki (Japan); Kenjiro Watanabe, Tokyo (Japan); Kimiyuki Hayasaki, Yokohama (Japan); Takayuki Ochiai, Tokyo (Japan); and Kenji Kitabatake, Kawasaki (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on Jun. 13, 2007, as Appl. No. 11/808,786.
Claims priority of application No. 2006-182428 (JP), filed on Jun. 30, 2006.
Prior Publication US 2008/0001985 A1, Jan. 03, 2008
Int. Cl. B41J 29/393 (2006.01)

U.S. Cl. 347—19

6 Claims

1. A liquid container that is provided with a container portion for storing a liquid and a control section capable of making a signal connection with a control circuit of a printing apparatus through a common signal line to said liquid container and other liquid container, said liquid container comprising:

detecting means for detecting a wave form C according to a difference between a wave form A of a signal outputted from the control section and passing through the common signal line and a wave form B of a signal inputted into the control section through the common signal line; and

transmitting means for, when the wave form C detected by said detecting means differs from the wave form A of the outputted signal, transmitting information indicating that the wave forms differ from each other to the control circuit of the printing apparatus through the common signal line.