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US4618672A
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Bisazo compounds useful as charge generating pigments in electrophotography
Assignee: Ricoh Co Ltd
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Filing: 1981-04-21
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Granted: 1986-10-21
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Expires: 2001-04-21
Abstract
Abstract Bisazo compounds represented by the general formula ##STR1## wherein R represents a halogen selected from the group consisting of fluorine, chlorine, bromine and iodine, and when R is fluorine, it is at the ortho, para or meta position in each phenylcarbamoyl group; when R is chlorine, it is at the ortho position; when R is bromine, it is positioned at the ortho or meta position; and when R is iodine, it is at the meta position, which bisazo compounds are particularly suitable for use in the charge generating layer of a layered electrophotographic photoconductor.
Inventors
- 👤 Mitsuru Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:50
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0675; G03G5/0679; C; C09; C09B; C09B35/00; C09B35/02; C09B35/039
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
108 words
A bisazo compund of the formula ##STR34## wherein R 1 and R 2 each represent a halogen selected from the group consisting of fluorine, chlorine, bromine and iodine, and when R 1 or R 2 is fluorine, it is present at the ortho, para or meta position in each phenylcarbamoyl group; when R 1 or R 2 is chlorine, it is at the ortho position in each phenylcarbamoyl group; when R 1 or R 2 is bromine, it is at the ortho or meta position in each phenylcarbamoyl group; and when R 1 or R 2 is iodine, it is at the meta position in each phenylcarbamoyl group.
Claim 2
Dependent Claim
108 words
A bisazo compund of the formula ##STR34## wherein R 1 and R 2 each represent a halogen selected from the group consisting of fluorine, chlorine, bromine and iodine, and when R 1 or R 2 is fluorine, it is present at the ortho, para or meta position in each phenylcarbamoyl group; when R 1 or R 2 is chlorine, it is at the ortho position in each phenylcarbamoyl group; when R 1 or R 2 is bromine, it is at the ortho or meta position in each phenylcarbamoyl group; and when R 1 or R 2 is iodine, it is at the meta position in each phenylcarbamoyl group.
Claim 3
Dependent Claim
34 words
The compound according to claim 1, wherein R 1 and R 2 in said formula each represent a fluorine atom which is present at the ortho, para or meta position in each phenylcarbamoyl group.
Claim 4
Dependent Claim
31 words
The compound according to claim 1, wherein R 1 and R 2 in said formula each represent a chlorine atom which is present at the ortho position of each phenylcarbamoyl group.
Claim 5
Dependent Claim
33 words
The compound according to claim 1, wherein R 1 and R 2 in said formula each represent a bromine atom which is present at the ortho or meta position of each phenylcarbamoyl group.
Claim 6
Dependent Claim
31 words
The compound according to claim 1, wherein R 1 and R 2 in said formula each represent an iodine atom which is present at the meta position of each phenylcarbamoyl group.
Claim 7
Dependent Claim
8 words
A bisazo compound represented by the formula ##STR35##
Claim 8
Dependent Claim
8 words
A bisazo compound represented by the formula ##STR35##
Claim 9
Dependent Claim
8 words
A bisazo compound represented by the formula ##STR36##
Claim 10
Dependent Claim
8 words
A bisazo compound represented by the formula ##STR36##
Claim 11
Dependent Claim
8 words
A bisazo compound represented by the formula ##STR37##
Claim 12
Dependent Claim
8 words
A bisazo compound represented by the formula ##STR37##
Claim 13
Dependent Claim
8 words
A bisazo compound represented by the formula ##STR38##
Claim 14
Dependent Claim
8 words
A bisazo compound represented by the formula ##STR38##
Claim 15
Dependent Claim
8 words
A bisazo compund represented by the formula ##STR39##
Claim 16
Dependent Claim
8 words
A bisazo compund represented by the formula ##STR39##
References Cited (Backward Citations)
JPS5422834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |