US3784376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductive element containing furans, indoles, or thiophenes
Assignee: Eastman Kodak Co
•
Filing: 1972-02-04
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Granted: 1974-01-08
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Expires: 1992-02-04
Abstract
Abstract Organic photoconductive elements of improved electrophotographic speed are prepared by coating on an electrically conducting support a photoconductive layer containing a 1,3diarylisobenzofuran or 1,3-diaryl-4,7-dihydroisobenzofuran or the corresponding isoindole or isobenzothiophene derivatives.
Inventors
- 👤 C Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:05
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0629; G03G5/0664; G03G5/0666; G03G5/0668; G03G5/067; G03G5/0672; G03G5/0674
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
18 words
An element according to claim 1 in which R1, R2, R3 and R4 are hydrogen or lower alkyl.
Claim 2
Dependent Claim
18 words
An element according to claim 2 in which a sensitizing dye is incorporated with the organic photoconductor compound.
Claim 3
Dependent Claim
14 words
An element according to claim 3 in which the organic photoconductor compound is 1,3-diphenylisobenzofuran.
Claim 4
Dependent Claim
14 words
An element according to claim 3 in which the organic photoconductor compound is 1,3-diphenyl-5,6-dimethylisobenzofuran.
Claim 5
Dependent Claim
14 words
An element according to claim 3 in which the organic photoconductor compound is 1,3-diphenyl-4,7-dihydroisobenzofuran.
Claim 6
Dependent Claim
42 words
An element according to claim 1 comprising a photoconductive layer coated on an electrically conducting support, said layer comprising (a) a photoconductive compound selected from the group consisting of 1,3-diphenylisobenzo-furan, 1,3-diphenyl-5,6-dimethylisobenzofuran and 1,3-diphenyl-4,7-dihydroisobenzofuran, (b) a sensitizing dye and (c) a polymeric binder.
Claim 7
Dependent Claim
24 words
An element according to claim 7 in which the polymeric binder is a major component of the photoconductive layer and is a terephthalic polyester.
Claim 8
Dependent Claim
24 words
An element according to claim 7 in which the polymeric binder is a major component of the photoconductive layer and is a bisphenol-A polycarbonate.
Claim 9
Dependent Claim
14 words
An element according to claim 3 in which the organic photoconductor compound is 1,2,3-triphenylisoindole.
References Cited (Backward Citations)
US3174854A
Cited
US3485625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |