Patent US3745504A successfully refreshed from Google Patents.
US3745504A
Expired / Lapsed
US
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Impregnated porous photoconductive device and method of manufacture
Assignee: Photophysics Inc
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Filing: 1971-03-22
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Granted: 1973-07-10
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Expires: 1991-03-22
Abstract
Abstract Impregnating a porous photoconductive device with molten glass, or some other physically and chemically stable substance, to make the dark resistance more predictable and to increase the charge retentivity many times.
Inventors
- 👤 J Mooney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:03
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/085
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
15 words
A method in accordance with claim 1 in which substantially the pores are fully impregnated.
Claim 2
Dependent Claim
19 words
A method in accordance with claim 1 in which the pores are partially impregnated leaving some pore space unimpregnated.
Claim 3
Independent Claim
54 words
A method of manufacturing a phOtoconductive device comprising the steps of: depositing a predetermined quantity of solid glass impregnant upon a porous mass of sintered photoconductive material; and heating said photoconductive material and said impregnant to the melting point of said impregnant for flowing the molten impregnant into the pores of said porous mass.
Claim 4
Independent Claim
95 words
A method of manufacturing a sintered photoconductive device comprising the steps of: depositing a mixture including a particulate photoconductive material upon a first metallic electrode; heating said mixture to a first temperature to sinter said mixture to form a sintered photoconductive element having said first electrode in conductive contact with one side thereof; depositing a predetermined quantity of glass upon said sintered photoconductive element; and heating said glass and said sintered photoconductive element to a second temperature sufficient to melt said glass for flowing the molten glass into the pores of said sintered photoconductive element.
Claim 5
Dependent Claim
36 words
A method of manufacturing a sintered photoconductive device as recited in claim 5 which further includes the step of providing a second metallic electrode in electrical contact with the other side of said sintered photoconductive element.
Claim 6
Dependent Claim
89 words
A method of manufacturing a sintered photoconductive device as recited in claim 5 wherein the quantity of glass de-posited on the sintered photoconductive element is in excess of the quantity required to completely fill the pores of said element and which, upon being cooled, forms a layer of glass of a predetermined thickness upon said element and which further includes the step of providing a second metallic electrode upon said layer of glass, said layer of glass electrically isolating said second electrode from the other side of said element.
Claim 7
Dependent Claim
35 words
A sintered photoconductive device comprising: a first metallic electrode; a sintered photoconductive element disposed in electrical contact with said first electrode; and an inorganic electrically nonconductive, solid impregnant disposed in the pores of said element.
Claim 8
Dependent Claim
29 words
A sintered photoconductive device as recited in claim 8 which further comprises a second metallic electrode in electrical contact with said member and spaced apart from said first electrode.
Claim 9
Dependent Claim
24 words
In a photoconductive device, including a sintered photoconductive element having pores, the improvement comprising an inorganic, electrically nonconductive, solid impregnant disposed in said pores.
Claim 10
Dependent Claim
24 words
In a photoconductive device in accordance with claim 10 in which said impregnant is transparent to the radia-tion to which said element is sensitive.
Claim 11
Dependent Claim
24 words
In a photoconductive device in accordance with claim 10 in which said impregnant is substantially inert to the ambient atmosphere and to said element.
Claim 12
Dependent Claim
17 words
In a photoconductive device in accordance with claim 10 in which said impregnant fully fills said pores.
Claim 13
Dependent Claim
17 words
In a photoconductive device in accordance with claim 10 in which said impregnant partially fills said pores.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |