Ink container with ring-shaped ink absorbing member

Patent 5557310 Issued on September 17, 1996. Estimated Expiration Date:

July 22, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Small printer
Patent #: 4436439
Issued on: 03/13/1984
Inventor: Koto

Liquid tank
Patent #: 4630758
Issued on: 12/23/1986
Inventor: Mutoh

Thermal ink jet pen body construction having improved ink storage and feed capability
Patent #: 4771295
Issued on: 09/13/1988
Inventor: Baker , et al.

Ink jet pen having improved ink storage and distribution capabilities
Patent #: 4794409
Issued on: 12/27/1988
Inventor: Cowger , et al.

Thermal ink jet pen having a feedtube with improved sizing and operational with a minimum of depriming
Patent #: 4931811
Issued on: 06/05/1990
Inventor: Cowger, et al.

Ink jet printer with self-regulating refilling system
Patent #: 4967207
Issued on: 10/30/1990
Inventor: Ruder

Refillable ink jet print system
Patent #: 4968998
Issued on: 11/06/1990
Inventor: Allen

Non-clogging cap and service station for ink-jet printheads
Patent #: 5027134
Issued on: 06/25/1991
Inventor: Harmon, et al.

Ink jet recording unit having an ink tank section containing porous material and a recording head section
Patent #: 5182581
Issued on: 01/26/1993
Inventor: Kashimura, et al.

Ink jet head cartridge Patent #: 5216450
Issued on: 06/01/1993
Inventor: Koitabashi, et al.

Inventors

Assignee

Canon Kabushiki Kaisha

Application

No. 279079 filed on 07/22/1994

US Classes:

347/87With integral ejector

Examiners

Primary: Le, N.

Attorney, Agent or Firm

Fitzpatrick, Cella, Harper & Scinto

Foreign Patent References

0139508 EP. 05/22/1985
0261764 EP. 03/22/1988
2470956 FR. 06/22/1981
0281850 JP. 11/22/1988

International Class

B41J 002/175

Foreign Application Priority Data

1989-10-20 JP

Abstract

An ink jet head cartridge includes a recording head for ejecting ink; an ink container for containing the ink to be supplied to the recording head; an ink supply port for supplying the ink from the container to the head; a porous ink absorbing material disposed in the container and having a ring shape with a central opening; and an engaging portion engaging with the central opening wherein the absorbing material has a higher density proximate to the supply port than proximate to the engaging portion.