US3898084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic processes using disazo pigments
Assignee: International Business Machines Corp
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Filing: 1973-10-01
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Granted: 1975-08-05
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Expires: 1993-10-01
Abstract
Abstract Electrophotographic processes using as the photoconductive material disazo pigment present as very small particles in an amount up to 10 percent of the total weight of the pigment particles plus the charge transport material.
Inventors
- 👤 Robert Bruce Champ
- 👤 Meredith David Shattuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:09
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0675; G03G5/0679
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
IN AN ELECTROPOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES THE STEPS OF UNIFORMLY CORONA CHARGING A PHOTOCONDUCTOR ON A CONDUCTIVE SUBSTRATE AND IMAGEWISE EXPOSING THE PHOTOCONDUCTOR TO LIGHT, THE IMPROVEMENT ACCORDING TO WHICH THE PHOTOCONDUCTOR COMPRISES PIGMENT PARTICLES AND BINDER MATERIAL, WITH THE PIGMENT PARTICLES BEING PRESENT AS POLYMOLECULAR AGGREGATES LESS THAN FIVE MICRONS IN SIZE AND HAVING A FORMULA
Claim 2
Dependent Claim
58 words
IN AN ELECTROPOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES THE STEPS OF UNIFORMLY CORONA CHARGING A PHOTOCONDUCTOR ON A CONDUCTIVE SUBSTRATE AND IMAGEWISE EXPOSING THE PHOTOCONDUCTOR TO LIGHT, THE IMPROVEMENT ACCORDING TO WHICH THE PHOTOCONDUCTOR COMPRISES PIGMENT PARTICLES AND BINDER MATERIAL, WITH THE PIGMENT PARTICLES BEING PRESENT AS POLYMOLECULAR AGGREGATES LESS THAN FIVE MICRONS IN SIZE AND HAVING A FORMULA
Claim 3
Dependent Claim
20 words
A process as claimed in claim 1 wherein the particle size of the pigment is less than about 1 micron.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 1 wherein the pigment is present as a layer overcoated with a binder layer capable of transporting the charge.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 1 wherein the pigment is dispersed in a binder which is a charge transport material.
Claim 6
Dependent Claim
14 words
A process as claimed in claim 4 wherein the binder is photoconductive per se.
Claim 7
Dependent Claim
15 words
A process as claimed in claim 4 wherein trinitrofluorenone has been added to the binder.
Claim 8
Dependent Claim
15 words
A process as claimed in claim 1 wherein the pigment is 3,3'' dichloro-4,4'' diphenyl bis-(1''''-azo-2''''hydroxy-3''''-naphthanilide).
Claim 9
Dependent Claim
14 words
A process as claimed in claim 1 wherein the pigment is 3, 3''dimethoxy-4,4''diphenyl bis-(1''''azo-2''''hydroxy-3''''-naphthanilide).
Claim 10
Dependent Claim
14 words
A process as claimed in claim 1 wherein the pigment is 3, 3''dimethyl-4,4''diphenyl bis-(1''''azo-2''''hydroxy-3''''-naphthanilide).
Claim 11
Dependent Claim
13 words
A process as claimed in claim 1 wherein the pigment is 3, 3''dibromo-4,4''diphenyl-bis-(1''''azo-2''''hydroxy-3''''-naphthanilide).
Claim 12
Dependent Claim
13 words
A process as claimed in claim 1 wherein the pigment is 4,4'' diphenyl-bis-(1''''-azo-2''''hydroxy-3''''-naphthanilide).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |