Patent US3615412A successfully refreshed from Google Patents.
US3615412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorene type compounds as organic photoconductors
Assignee: AB Dick Co
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Filing: 1969-04-30
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Granted: 1971-10-26
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Expires: 1989-04-30
Abstract
Abstract An organic photoconductor which is the compound fluorene and derivatives in which fluorene is fused with benzo and naphtho ring structures. The dibenzofluorenes and fluorenes are dispersed in suitable resin binders over the range of 1-100 parts by weight to 10 parts binder and applied to a conductive substrate.
Inventors
- 👤 William J Hessel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:52
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0605; G03G5/0607; G03G5/0609
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
The photoelectrostatic member as claimed in claim 1 wherein said photoconductive material is 2,3, Benzofluorene.
Claim 2
Dependent Claim
15 words
The photoelectrostatic member as claimed in claim 1 wherein said photoconductive material is 1,2 Benzofluorene.
Claim 3
Dependent Claim
15 words
The photoelectrostatic member as claimed in claim 1 wherein said photoconductive material is 3,4, Benzofluorene.
Claim 4
Dependent Claim
15 words
The photoelectrostatic member as claimed in claim 1 wherein said photoconductive material is 2,3:6,7 dibenzofluorene.
Claim 5
Dependent Claim
15 words
The photoelectrostatic member as claimed in claim 1 wherein said photoconductor material is 1,2:5,6 dibenzofluorene.
Claim 6
Dependent Claim
15 words
The photoelectrostatic member as claimed in claim 1 wherein said photoconductive material is 1,2:7,8 dibenzofluorene.
Claim 7
Dependent Claim
94 words
A photo reproduction process which comprises exposing an electrostatically charged photoconductive layer adhered on a conductive base support to a pattern of light and shadow and developing the resulting charge image with a developer material, the photoconductive layer comprising a compound having the general formula: where R1 is a fused arenic ring structure having eight carbon atoms and R2 is a fused arenic ring structure having four or eight carbon atoms and x and Y represent hydrogen, halogen, lower alkyl and lower alkoxy, said photoconductive material being dispersed in a film forming resin bInder.
Claim 8
Dependent Claim
16 words
The photoelectrostatic member as claimed in claim 1 wherein said photoconductive material is 1,2,7,10-tetramethoxy-11H, benzo fluorene.
Claim 9
Dependent Claim
15 words
The photoelectrostatic member as claimed in claim 1 wherein said photoconductive material is 6-isopropyl-11H-benzo fluorene.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |