US3887366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyanine pigments in electrophotographic processes
Assignee: International Business Machines Corp
•
Filing: 1971-03-30
•
Granted: 1975-06-03
•
Expires: 1991-03-30
Abstract
Abstract Electrophotographic processes using as the photoconductive material cyanine pigment present as very small particles.
Inventors
- 👤 Robert Bruce Champ
- 👤 Meredith David Shattuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:33
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0666; G03G5/0668; G03G5/067
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
42 words
In an electrophotographic reproduction process which comprises selectively rendering portions of a photoconductor electrically conductive by selective exposure to light, the improvement according to which the photoconductor comprises polymolecular aggregates less than five microns in sIze of a pigment having the formula:
Claim 2
Dependent Claim
42 words
In an electrophotographic reproduction process which comprises selectively rendering portions of a photoconductor electrically conductive by selective exposure to light, the improvement according to which the photoconductor comprises polymolecular aggregates less than five microns in sIze of a pigment having the formula:
Claim 3
Dependent Claim
42 words
IN AN ELECTROPHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES SELECTIVELY RENDERING PORTIONS OF A PHOTOCONDUCTOR ELECTRICALLY CONDUCTIVE BY SELECTIVE EXPOSURE TO LIGHT, THE IMPROVEMENT ACCORDING TO WHICH THE PHOTOCONDUCTOR COMPRISES POLYMOLECULAR AGGREGATES LESS THAN FIVE MICRONS IN SIZE OR A PIGMENT HAVING THE FORMULA:
Claim 4
Dependent Claim
42 words
IN AN ELECTROPHOTOGRAPHIC REPRODUCTION PROCESS WHICH COMPRISES SELECTIVELY RENDERING PORTIONS OF A PHOTOCONDUCTOR ELECTRICALLY CONDUCTIVE BY SELECTIVE EXPOSURE TO LIGHT, THE IMPROVEMENT ACCORDING TO WHICH THE PHOTOCONDUCTOR COMPRISES POLYMOLECULAR AGGREGATES LESS THAN FIVE MICRONS IN SIZE OR A PIGMENT HAVING THE FORMULA:
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1 wherein the particles of pigment are less than 1 micron in size.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 1 wherein the pigment is in the form of a layer overcoated with a charge transport layer.
Claim 7
Dependent Claim
15 words
A process as claimed in claim 1 wherein the pigment is dispersed in a binder.
Claim 8
Dependent Claim
12 words
A process as claimed in claim 4 wherein the binder comprises trinitrofluorenone.
Claim 9
Dependent Claim
13 words
A process as claimed in claim 4 wherein the binder comprises sucrose benzoate.
Claim 10
Dependent Claim
15 words
A process as claimed in claim 1 wherein the pigment is 3,3''-diethyl benzothiozolium dicarbocyanine iodide.
References Cited (Backward Citations)
US2663636A
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US3041166A
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US3257204A
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US3250615A
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US3196011A
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US3542547A
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US3507692A
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US3615414A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |