Patent US4284701A successfully refreshed from Google Patents.
US4284701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic toner of specific size distribution
Assignee: IBM Information Products Corp
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Filing: 1980-09-03
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Granted: 1981-08-18
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Expires: 2000-09-03
Abstract
Abstract A toner material for use in developing images in an electrostatographic device is disclosed. The toner particles are initially classified according to a size distribution wherein less than 15% by weight are greater than 16 microns, between 7 and 15% by weight are less than 5 microns the remainder being from 5 to 16 microns and wherein the median particle size by weight is from 8 to 12 microns. The toner is used in a developer mix with carrier particles, and preferably the toner carrier mix is equilibrated such that the action of the developer mix and the machine provide a toner particle size distribution wherein less than 12% by weight are greater than 16 microns, between 15 and 30% by weight are less than 5 microns, the remainder being from 5 to 16 microns, and wherein the median particle size by weight is between 6.5 and 9.5 microns. An equilibrated toner particle distribution is also disclosed.
Inventors
- 👤 Jerry J. Abbott
- 👤 Sterritt R. Fuller
- 👤 Paul D. Jachimiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:18
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0819
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
An electrostatographic toner material comprising particles having the following size distributions: less than 15% by weight being greater than 16 microns in size, from 7 to 15% by weight being less than 5 microns in size, the remainder being from 5 to 16 microns in size, the particle median size by weight being from 8 to 12 microns.
Claim 2
Dependent Claim
58 words
An electrostatographic toner material comprising particles having the following size distributions: less than 15% by weight being greater than 16 microns in size, from 7 to 15% by weight being less than 5 microns in size, the remainder being from 5 to 16 microns in size, the particle median size by weight being from 8 to 12 microns.
Claim 3
Dependent Claim
46 words
An electrostatographic toner material according to claim 1 wherein less than 2% by weight are greater than 16 microns in size, from 9 to 15% by weight are less than 5 microns in size, the median particle size by weight being from 8.5 to 9.5 microns.
Claim 4
Dependent Claim
20 words
An electrostatographic toner according to claim 1 wherein the median particle size by weight is between 8.5 and 9.5 microns.
Claim 5
Dependent Claim
21 words
An electrostatographic toner according to claim 1 wherein there is less than 2% by weight of particles greater than 16 microns.
Claim 6
Dependent Claim
19 words
An electrostatographic toner according to claim 1 wherein from 9 to 15% by weight are less than 5 microns.
Claim 7
Dependent Claim
67 words
A developer mix for electrostatographic copying comprising toner particles and carrier particles of opposite triboelectric charges, said toner particles having the following size distribution: less than 15% by weight being greater than 16 microns in size, from 7 to 15% by weight being less than 5 microns, the remainder being from 5 to 16 microns, the median particle size by weight being from 8 to 12 microns.
Claim 8
Dependent Claim
67 words
A developer mix for electrostatographic copying comprising toner particles and carrier particles of opposite triboelectric charges, said toner particles having the following size distribution: less than 15% by weight being greater than 16 microns in size, from 7 to 15% by weight being less than 5 microns, the remainder being from 5 to 16 microns, the median particle size by weight being from 8 to 12 microns.
Claim 9
Dependent Claim
45 words
A developer mix according to claim 6 wherein the toner particle size distribution is less than 2% by weight greater than 16 microns, from 9 to 15% by weight less than 5 microns, the median particle size by weight being from 8.5 to 9.5 microns.
Claim 10
Dependent Claim
21 words
A developer mix according to claim 6 wherein the median toner particle size by weight is between 8.5 to 9.5 microns.
Claim 11
Dependent Claim
22 words
A developer mix according to claim 6 wherein there is less than 2% by weight of toner particles greater than 16 microns.
Claim 12
Dependent Claim
23 words
A developer mix according to claim 6 wherein there is from 9 to 15% by weight of toner particles less than 5 microns.
Claim 13
Dependent Claim
95 words
In an electrostatic developing process, wherein a mix of toner and carrier particles are provided and applied to a photoconductor to develop a latent electrostatic image thereon, and wherein the developed image is transferred to a copy sheet, the improvement which comprises, maintaining a developer mix having toner particles therein equilibrated to the following size distribution; less than 12% by weight greater than 16 microns, from 15 to 30% by weight less than 5 microns, the remainder from 5 to 16 microns, the median toner particle size by weight being between 6.5 and 9.5 microns.
Claim 14
Dependent Claim
95 words
In an electrostatic developing process, wherein a mix of toner and carrier particles are provided and applied to a photoconductor to develop a latent electrostatic image thereon, and wherein the developed image is transferred to a copy sheet, the improvement which comprises, maintaining a developer mix having toner particles therein equilibrated to the following size distribution; less than 12% by weight greater than 16 microns, from 15 to 30% by weight less than 5 microns, the remainder from 5 to 16 microns, the median toner particle size by weight being between 6.5 and 9.5 microns.
References Cited (Backward Citations)
US3262806A
Cited
US3586654A
Cited
US3674736A
Cited
US3910846A
Cited
US3989648A
Cited
DE2522771A1
Cited
US4122024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |