US3655378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charge-transfer complexes of dibenzofuran-formaldehyde or dibenzothiophene-formaldehyde resins as photoconductive materials
Assignee: Eastman Kodak Co
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Filing: 1971-03-01
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Granted: 1972-04-11
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Expires: 1991-03-01
Abstract
Abstract Certain formaldehyde resins are disclosed which form complexes with Lewis acids such as trinitrofluorenone to produce photoconductive compositions and elements of high speed and utility for electrostatic image formation.
Inventors
- 👤 Lawrence E Contois
- 👤 Stewart H Merrill
- 👤 George S Grau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:05
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
16 words
The element of claim 1 wherein said photoconductive composition contains a sensitizer for said photoconductive complex.
Claim 2
Dependent Claim
16 words
The element of claim 1 wherein the photoconductive complex is formed from dibenzofuran-formaldehyde resin and 2,4,7-trinitrofluorenone.
Claim 3
Dependent Claim
16 words
The element of claim 1 wherein the photoconductive complex if formed from dibenzothiophene-formaldehyde resin and 2,4,7-trinitrofluorenone.
Claim 4
Dependent Claim
17 words
The element of claim 1 wherein said photoconductive composition contains a film-forming polymeric binder for said complex.
Claim 5
Dependent Claim
100 words
An electrophotographic element comprising a conductive support having coated thereon a photoconductive composition comprising a. from about 0.01 to about 90 percent by weight based on said photoconductive composition of a complex formed by a resin selected from the group consisting of dibenzofuran-formaldehyde resins and dibenzothiophene-formaldehyde resins and a compound selected from the group consisting of 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone, 2,6-dichloro-p-benzoquinone, 2,5-dinitro-9-fluorenone, 1,5-dichloro-2,4-dinitrobenzene, 2,5-dichloro-p-benzoquinone, tetrachloro-quinone, 2-chloro-3,5-dinitro-pyridine, 2,4,5,7,9-pentanitro-indene(2,1-a)fluoren-11,12-dione, 2,5-diphenyl-p-benzoquinone, 2,3-dichloro-1,4-naphthoquinone, 9-dicyanomethylene-2,4,7-trinitrofluorene, b. a film-forming polymeric binder for said complex and c. from about 0.005 percent to about 5 percent by weight based on said photoconductive composition of a sensitizer for said photoconductive composition.
Claim 6
Dependent Claim
48 words
In an electrophotographic process wherein an electrostatic charge pattern is formed on an electrophotographic element, the improvement characterized in that said electrophotographic element has a photoconductive layer comprising a complex of a Lewis acid and a resin selected from the group consisting of dibenzofuran-formaldehyde resins and dibenzothiophene-formaldehyde resins.
Claim 7
Dependent Claim
18 words
The process of claim 7 wherein the photoconductive layer comprises a complex formed between dibenzofuran-formaldehyde resin and 2,4,7-trinitrofluorenone.
Claim 8
Dependent Claim
18 words
The process of claim 7 wherein the photoconductive layer comprises a complex formed between dibenzothiophene-formaldehyde resin and 2,4,7-trinitrofluorenone.
Claim 9
Dependent Claim
83 words
An electrophotographic element comprising a conductive support having coated thereon a photoconductive composition comprising. a. from about 0.01 to about 90 percent by weight based on said photoconductive composition of a complex formed by a resin selected from the group consisting of dibenzofuran-formaldehyde resins and dibenzothiophene-formaldehyde resins and 2, 4, 7-trinitro-9-fluorenone, b. a film-forming polymeric binder for said complex, and c. from about 0.005 percent to about 5 percent by weight based on said photoconductive composition of a sensitizer for said photoconductive composition.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |