Patent US3954464A successfully refreshed from Google Patents.
US3954464A
Expired / Lapsed
US
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Method of fabricating a composite trigonal selenium photoreceptor
Assignee: Xerox Corp
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Filing: 1974-05-28
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Granted: 1976-05-04
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Expires: 1994-05-28
Abstract
Abstract A method of making a photosensitive imaging device which comprises; vacuum evaporating a thin layer of vitreous selenium over a layer of electrically active organic material which is contained on a supporting substrate, forming a relatively thin layer of electrically insulating or electrically active organic material over said selenium layer, followed by heating said device to an elevated temperature for a time sufficient to convert the vitreous selenium to the crystalline trigonal form. The imaging device is also disclosed.
Inventors
- 👤 Ronald E. Karam
- 👤 Richard P. Millonzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:41
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G5/08207; G03G5/043; G03G5/0436
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A method of making a photosensitive imaging device which comprises; a. forming a layer of electrically active organic material on a supporting substrate, (b) vacuum depositing a layer consisting essentially of vitreous selenium over said electrically active layer to a thickness of from 0.03 to 0.8 micron, (c) forming a relatively thin layer of electrically active or insulating organic material over said vitreous selenium layer, followed by (d) heating said device to a temperature in the range of 125° to 210°C for 1 to 24 hours to convert the vitreous selenium to the crystalline trigonal form.
Claim 2
Independent Claim
96 words
A method of making a photosensitive imaging device which comprises; a. forming a layer of electrically active organic material on a supporting substrate, (b) vacuum depositing a layer consisting essentially of vitreous selenium over said electrically active layer to a thickness of from 0.03 to 0.8 micron, (c) forming a relatively thin layer of electrically active or insulating organic material over said vitreous selenium layer, followed by (d) heating said device to a temperature in the range of 125° to 210°C for 1 to 24 hours to convert the vitreous selenium to the crystalline trigonal form.
Claim 3
Dependent Claim
28 words
The method of claim 1 in which the electrically active layers comprise a material selected from the group consisting of polyvinyl carbazole, polyvinyl pyrene, 2,4,7-trinitro-9-fluorenone, and mixtures thereof.
Claim 4
Dependent Claim
17 words
The method of claim 1 in which the relatively thin top layer comprises an electrically insulating resin.
Claim 5
Dependent Claim
50 words
An imaging device which comprises a supporting substrate having a layer of electrically active organic material overlaying said substrate, a layer of trigonal selenium about 0.03 to 0.8 microns thick overlaying said electrically active layer, and a relatively thin protective top layer of organic material overlaying said trigonal selenium layer.
Claim 6
Dependent Claim
50 words
An imaging device which comprises a supporting substrate having a layer of electrically active organic material overlaying said substrate, a layer of trigonal selenium about 0.03 to 0.8 microns thick overlaying said electrically active layer, and a relatively thin protective top layer of organic material overlaying said trigonal selenium layer.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein the electrically active organic material is carbazole, pyrene, tetra phenyl pyrene, benzochrysene, perylene, tetracene, pycene, fluorene, fluorenone or naphthalene.
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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |