US3922169A
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: 1974-09-25
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Granted: 1975-11-25
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Expires: 1994-09-25
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
2026-11-07 18:46
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0612; G03G5/0616; G03G17/00; G03G17/04; G03G5/0618; G03G5/062
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
86 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 MIGRATE PARTICLES IS FORMED, SAID SUSPENSION COMPRISING PARTICLES OF A PIGMENT HAVING THE FORMULA:
Claim 2
Independent Claim
86 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 MIGRATE PARTICLES IS FORMED, SAID SUSPENSION COMPRISING PARTICLES OF A PIGMENT HAVING THE FORMULA:
Claim 3
Dependent Claim
6 words
The method of claim 1 wherein
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |