Patent US5381219A successfully refreshed from Google Patents.
US5381219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Size distribution of carrier particles for use in a magnetic brush
Assignee: EASTMEN KODAK Co PATENT LEGAL STAFF
•
Filing: 1992-11-02
•
Granted: 1995-01-10
•
Expires: 2012-11-02
Abstract
Abstract The present invention relates to carrier particles which are used in image reproduction machines that include a magnetic brush for cleaning an imaging member. These carrier particles are utilized by the magnetic brush to clean the imaging member. The carrier particles include magnetic particles having a particle size distribution ranging from about 150 microns in diameter to about 1 micron in diameter. Preferably at least about 50% by weight of the magnetic particles have a diameter of less than about 45 microns. Preferably the carrier particles have an aspect ratio of about 8 and are made of stainless steel or iron.
Inventors
- 👤 Edward T. Miskinis
- 👤 Orville C. Rodenberg
- 👤 Bijay S. Saha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:49
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0005; G03G21/0047; G03G9/00; G03G9/08; G03G9/10; G03G9/107; G03G9/1075; G03G9/1087
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
81 words
For use in an image reproduction machine which includes a magnetic cleaning brush and an imaging member, carrier particles which are utilized by the magnetic cleaning brush to clean the imaging member, said carrier particles comprising: magnetic particles wherein at least about 50% by weight of said magnetic particles have a diameter of less than about 45 microns and wherein said magnetic particles have a particle size distribution ranging from about 1 micron in diameter to about 150 microns in diameter.
Claim 2
Dependent Claim
81 words
For use in an image reproduction machine which includes a magnetic cleaning brush and an imaging member, carrier particles which are utilized by the magnetic cleaning brush to clean the imaging member, said carrier particles comprising: magnetic particles wherein at least about 50% by weight of said magnetic particles have a diameter of less than about 45 microns and wherein said magnetic particles have a particle size distribution ranging from about 1 micron in diameter to about 150 microns in diameter.
Claim 3
Dependent Claim
16 words
Carrier particles as defined in claim 1 wherein said magnetic particles are comprised of stainless steel.
Claim 4
Dependent Claim
18 words
Carrier particles as defined in claim 1 wherein said magnetic particles have an aspect ratio of about 8.
Claim 5
Dependent Claim
16 words
Carrier particles as defined in claim 3 wherein said magnetic particles are comprised of stainless steel.
Claim 6
Dependent Claim
15 words
Carrier particles as defined in claim 1 wherein said magnetic particles are comprised of iron.
Claim 7
Dependent Claim
18 words
Carrier particles as defined in claim 5 wherein said magnetic particles have an aspect ratio of about 8.
Claim 8
Dependent Claim
13 words
The carrier particles of claim 1 in combination with a magnetic cleaning brush.
Claim 9
Dependent Claim
106 words
A magnetic brush for utilization in an image reproduction machine, comprising: a core including a series of alternating pole magnets; a conductive, nonmagnetic shell surrounding the core and having an outer surface; a supply of magnetic carder particles wherein at least about 50% by weight of said magnetic carrier particles have a diameter of less than about 45 microns and wherein said magnetic carrier particles have a particle size distribution ranging from about 1 micron in diameter to about 150 microns in diameter; means for applying said carrier particles to said outer surface of said shell; and means for applying an electrical voltage to said shell.
Claim 10
Dependent Claim
106 words
A magnetic brush for utilization in an image reproduction machine, comprising: a core including a series of alternating pole magnets; a conductive, nonmagnetic shell surrounding the core and having an outer surface; a supply of magnetic carder particles wherein at least about 50% by weight of said magnetic carrier particles have a diameter of less than about 45 microns and wherein said magnetic carrier particles have a particle size distribution ranging from about 1 micron in diameter to about 150 microns in diameter; means for applying said carrier particles to said outer surface of said shell; and means for applying an electrical voltage to said shell.
Claim 11
Dependent Claim
17 words
The magnetic brush as defined in claim 8 wherein said carrier particles are comprised of stainless steel.
Claim 12
Dependent Claim
19 words
The magnetic brush as defined in claim 8 wherein said carrier particles have an aspect ratio of about 8.
Claim 13
Dependent Claim
17 words
The magnetic brush as defined in claim 10 wherein said carrier particles are comprised of stainless steel.
Claim 14
Dependent Claim
16 words
The magnetic brush as defined in claim 8 wherein said carrier particles are comprised of iron.
Claim 15
Dependent Claim
19 words
The magnetic brush as defined in claim 12 wherein said carrier particles have an aspect ratio of about 8.
Claim 16
Dependent Claim
16 words
The magnetic brush as defined in claim 8 and wherein said brush is a cleaning brush.
Claim 17
Dependent Claim
108 words
For use in an image reproduction machine which includes a magnetic cleaning brush and an imaging member, carder particles which are utilized by the magnetic cleaning brush to clean the imaging member, said carrier particles comprising: magnetic particles wherein at least about 50% by weight of said magnetic particles have a diameter of less than about 45 microns and wherein there is a substantial amount of particles larger than 45 microns and the magnetic particles are generally flake-like particles having an aspect ratio of about 8 with the aspect ratio representing a ratio of an average surface area of a particle divided by the particle's average cross-sectional area.
Claim 18
Dependent Claim
108 words
For use in an image reproduction machine which includes a magnetic cleaning brush and an imaging member, carder particles which are utilized by the magnetic cleaning brush to clean the imaging member, said carrier particles comprising: magnetic particles wherein at least about 50% by weight of said magnetic particles have a diameter of less than about 45 microns and wherein there is a substantial amount of particles larger than 45 microns and the magnetic particles are generally flake-like particles having an aspect ratio of about 8 with the aspect ratio representing a ratio of an average surface area of a particle divided by the particle's average cross-sectional area.
Claim 19
Dependent Claim
13 words
The carrier particles of claim 15 in combination with a magnetic cleaning brush.
References Cited (Backward Citations)
US2911330A
Cited
US4125667A
Cited
US4310611A
Cited
US4754304A
Cited
JPS58114073A
Cited
US4482621A
Cited
JPS58202474A
Cited
JPS59223458A
Cited
US4554234A
Cited
US4916492A
Cited
US4972233A
Cited
US5014089A
Cited
US4978597A
Cited
US5009973A
Cited
JPH02143286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |