Patent US2820644A successfully refreshed from Google Patents.
Patent US3867141A successfully refreshed from Google Patents.
US3867141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric and electrophotographic pigments comprising derivatives of condensed polycyclic aromatic hydrocarbon aldehydes
Assignee: Xerox Corp
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Filing: 1973-03-05
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Granted: 1975-02-18
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Expires: 1993-03-05
Abstract
Abstract An electrophoretic imaging system which is capable of polychromatic or monochromatic imaging is disclosed, using as at least a portion of the imaging material compounds which are the reaction product of a condensed polycyclic aromatic hydrocarbon aldehyde and certain ketones or amines containing active hydrogen. These compounds may also be used in the preparation of electrophotographic plates for xerography.
Inventors
- 👤 John Alf Bergfjord
- 👤 Steven James Grammatica
- 👤 Richard William Radler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:40
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0618
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
25 words
A PHOTOELECTROPHORETIC IMAGING SUSPENSION COMPRISING A SUBSTANTIALLY INSULATING LIQUID CARRIER MEDIUM HAVING DISPERSED THEREIN AN ELECTRICALLY PHOTOSENSITIVE PIGMENT COMPOSITION COMPRISING A PIGMENT HAVING THE FORMULA:
Claim 2
Dependent Claim
25 words
A PHOTOELECTROPHORETIC IMAGING SUSPENSION COMPRISING A SUBSTANTIALLY INSULATING LIQUID CARRIER MEDIUM HAVING DISPERSED THEREIN AN ELECTRICALLY PHOTOSENSITIVE PIGMENT COMPOSITION COMPRISING A PIGMENT HAVING THE FORMULA:
Claim 3
Dependent Claim
6 words
The suspension of claim 1 wherein
Claim 4
Dependent Claim
6 words
The suspension of claim 1 wherein
Claim 5
Dependent Claim
21 words
The suspension of claim 1 which further contains additional pigment selected from the group consisting of cyan, magenta and mixtures thereof.
Claim 6
Dependent Claim
17 words
The suspension of claim 4 wherein said additional pigment comprises a mixture of cyan and magenta pigments.
Claim 7
Dependent Claim
16 words
The suspension of claim 5 wherein said substantially insulating carrier medium comprises a liquid aliphatic hydrocarbon.
Claim 8
Dependent Claim
88 words
A method of photoelectrophoretic imaging comprising: a. providing a layer of an imaging suspension comprising electrically photosensitive particles in an insulating liquid between at least two electrodes, at least one electrode being at least partially transparent; b. exposing said suspension to a pattern of elecTromagnetic rediation to which at least a portion of said particles are sensitive and, c. applying an electrical field across said suspension until an image made up of migrated particles is formed, said suspension comprising particles of a pigment as defined in claim 1.
Claim 9
Dependent Claim
88 words
A method of photoelectrophoretic imaging comprising: a. providing a layer of an imaging suspension comprising electrically photosensitive particles in an insulating liquid between at least two electrodes, at least one electrode being at least partially transparent; b. exposing said suspension to a pattern of electromagnetic radiation to which at least a portion of said particles are sensitive; and, c. applying an electrical field across said suspension until an image made up of migrated particles is formed, said suspension comprising particles of a pigment as defined in claim 3.
Claim 10
Dependent Claim
22 words
A xerographic plate comprising a photoconductive layer comprising an electrically insulating binder material having uniformly dispersed therein a compound having the formula:
Claim 11
Dependent Claim
22 words
A xerographic plate comprising a photoconductive layer comprising an electrically insulating binder material having uniformly dispersed therein a compound having the formula:
Claim 12
Dependent Claim
38 words
A process for forming a latent xerographic image on a photoconductive layer which comprises electrostatically charging said layer and exposing said layer to a pattern of activating electromagnetic radiation, said photoconductive layer comprising the composition of claim 9.
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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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |