Developing device using a two-ingredient type developer and...

Details Developing device using a two-ingredient type developer and... Developing device using a two-ingredient type developer and...

2005-03-29

2005-03-29

Beatty, Robert (Department: 2852)

Electrophotography

Image formation

Development

C399S267000, C430S106100, C430S110400

Reexamination Certificate

active

06873814

ABSTRACT:
A developing device including a developer containing magnetic toner grains and includes a main pole for development disposed in a sleeve. Flux density generated by the magnetic pole in a direction normal to the surface of the sleeve outside of the surface has an attenuation ratio of 50% or above. The toner grains have a weight mean grain size of 6.0 μm to 8.0 μm while the toner grains having grain sizes of 5 μm and below occupy 40% to 80% of the entire developer. The toner grains have magnetization strength of 10 emu/g to 25 emu/g in a magnetic field of 5 kOe or magnetization strength of 7 emu/g to 20 emu/g in a magnetic field of 1 kOe. The toner grains reduce toner scattering and image defects despite that they are magnetic, thereby implementing ultrahigh resolution.

REFERENCES:
patent: 4502412 (1985-03-01), Jones
patent: 5014089 (1991-05-01), Sakashita et al.
patent: 5137796 (1992-08-01), Takiguchi et al.
patent: 5486443 (1996-01-01), Grande et al.
patent: 5618647 (1997-04-01), Kukimoto et al.
patent: 5663026 (1997-09-01), Kasuya et al.
patent: 6335137 (2002-01-01), Suzuki et al.
patent: 6337957 (2002-01-01), Tamaki et al.
patent: 6403275 (2002-06-01), Kuramoto et al.
patent: 6442364 (2002-08-01), Kai et al.
patent: 6468706 (2002-10-01), Matsuda et al.
patent: 6505014 (2003-01-01), Aoki et al.
patent: 6507718 (2003-01-01), Ohjimi et al.
patent: 6638674 (2003-10-01), Komoto et al.
patent: 6-332237 (1994-12-01), None
patent: 8-114986 (1996-05-01), None
patent: 9-022178 (1997-01-01), None
patent: 2000-039740 (2000-02-01), None
patent: 2000-305360 (2000-11-01), None
patent: 2000-321867 (2000-11-01), None
patent: 2001-027849 (2001-01-01), None
patent: 2001-296743 (2001-10-01), None
U.S. Appl. No. 10/836,264, filed May 3, 2004, Shintani et al.
U.S. Appl. No. 10/820,726, filed Apr. 9, 2004, Koike et al.
U.S. Appl. No. 10/792,694, filed Mar. 5, 2004, Tsuda et al.
U.S. Appl. No. 10/759,197, filed Jan. 20, 2004, Emoto et al.
U.S. Appl. No. 10/793,320, filed Mar. 5, 2004, Higuchi et al.
U.S. Appl. No. 10/760, 452, filed Jan. 21, 2004, Higuchi et al.
U.S. Appl. No. 10/745,532, filed Dec. 29, 2003, Sano et al.
U.S. Appl. No. 10/725,402, filed Dec. 3, 2003, Shintani et al.
U.S. Appl. No. 10/724,260, filed Dec. 1, 2003, Emoto et al.
U.S. Appl. No. 10/712,026, filed Nov. 14, 2003, Tomita et al.
U.S. Appl. No. 10/666,254, filed Sep. 22, 2003, Kondo et al.
U.S. Appl. No. 10/645,804, filed Aug. 22, 2003, Tomita et al.
U.S. Appl. No. 10/661, 569, filed Sep. 15, 2003, Kosuge et al.
U.S. Appl. No. 10/652,505, filed Sep. 2, 2003, Murakami et al.
U.S. Appl. No. 10/653,097, filed Sep. 3, 2003, Kimura et al.
U.S. Appl. No. 10/631,727, filed Aug. 1, 2003, Suzuki et al.
U.S. Appl. No. 09/656,414, filed Sep. 6, 2000, unknown.
U.S. Appl. No. 09/565,539, filed May 5, 2000, allowed.
U.S. Appl. No. 09/567,982, filed May 10, 2000, allowed.
U.S. Appl. No. 09/820,609, filed Mar. 30, 2001, pending.
U.S. Appl. No. 09/873,246, filed Jun. 5, 2001, pending.
U.S. Appl. No. 09/905,872, filed Jul. 17, 2001, pending.
U.S. Appl. No. 09/943,505, filed Aug. 31, 2001, pending.
U.S. Appl. No. 09/944,076, filed Sep. 4, 2001, pending.
U.S. Appl. No. 09/965,826, filed Oct. 1, 2001, pending.
U.S. Appl. No. 09/953,922, filed Sep. 18, 2001, allowed.
U.S. Appl. No. 09/982,877, filed Oct. 22, 2001, pending.
U.S. Appl. No. 09/963,429, filed Sep. 27, 2001, allowed.
U.S. Appl. No. 09/996,585, filed Nov. 30, 2001, pending.
U.S. Appl. No. 10/041,582, filed Jan. 10, 2002, pending.
U.S. Appl. No. 10/077,813, filed Feb. 20, 2002, pending.
U.S. Appl. No. 10/077,752, filed Feb. 20, 2002, pending.
U.S. Appl. No. 10/083,159, filed Feb. 27, 2002, pending.
U.S. Appl. No. 10/086,683, filed Mar. 4, 2002, pending.
U.S. Appl. No. 10/098,591, filed Mar. 18, 2002, pending.
U.S. Appl. No. 10/151,103, filed May 21, 2002, pending.
U.S. Appl. No. 10/155,111, filed May 28, 2002, pending.
U.S. Appl. No. 10/285,636, filed Nov. 1, 2002, pending.
U.S. Appl. No. 10/788,488, filed Mar. 1, 2004, Arai et al.
U.S. Appl. No. 10/780,773, filed Feb. 19, 2004, Satoh.

Affiliated with

Also associated with

Rating

Developing device using a two-ingredient type developer and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Developing device using a two-ingredient type developer and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Developing device using a two-ingredient type developer and... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3402984