Patent US841099A successfully refreshed from Google Patents.
US4572884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stilbene derivatives and electrophotographic photoconductor comprising one stilbene derivative
Assignee: Ricoh Co Ltd
•
Filing: 1983-11-22
•
Granted: 1986-02-25
•
Expires: 2003-11-22
Abstract
Abstract Stilbene derivatives of the formula ##STR1## and an electrophotographic photoconductor comprising an electroconductive support material and a photosensitive layer comprising at least one stilbene derivative of the same formula are disclosed, in which R 1 represents a lower alkyl group, an alkoxy group or an unsubstituted or substituted phenoxy group or a hydroxyl group, R 2 represents hydrogen, a lower alkyl group or an unsubstituted or substituted phenyl group, Ar represents ##STR2## or a 9-anthryl group, R 3 represents hydrogen, an alkyl group, an alkoxy group halogen or substituted amino group represented by ##STR3## (in which R 4 and R 5 each represent an alkyl group, an unsubstituted or substituted aralkyl group, or an unsubstituted of substituted aryl group), m is an integer of 0, 1, 2 or 3, and n is an integer of 0 or 1.
Inventors
- 👤 Masaomi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:21
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0666; G03G5/0668
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
An electrophotographic photoconductor comprising an electroconductive support material and a photosensitive layer comprising at least one stilbene derivative of the formula ##STR903## wherein R 1 represents a lower alkyl group, an alkoxy group, an unsubstituted or substituted phenoxy group or a hydroxyl group, R 2 represents hydrogen, a lower alkyl group or an unsubstituted or substituted phenyl group; Ar represents ##STR904## or a 9-anthryl group, R 3 represents hydrogen, an alkyl group, an alkoxy group, halogen or a substituted amino group represented by ##STR905## in which R 4 and R 5 each represent an alkyl group, an unsubstituted or substituted aralkyl group, or an unsubstituted or substituted aryl group, and m is an integer of 0, 1, 2 or 3.
Claim 2
Dependent Claim
120 words
An electrophotographic photoconductor comprising an electroconductive support material and a photosensitive layer comprising at least one stilbene derivative of the formula ##STR903## wherein R 1 represents a lower alkyl group, an alkoxy group, an unsubstituted or substituted phenoxy group or a hydroxyl group, R 2 represents hydrogen, a lower alkyl group or an unsubstituted or substituted phenyl group; Ar represents ##STR904## or a 9-anthryl group, R 3 represents hydrogen, an alkyl group, an alkoxy group, halogen or a substituted amino group represented by ##STR905## in which R 4 and R 5 each represent an alkyl group, an unsubstituted or substituted aralkyl group, or an unsubstituted or substituted aryl group, and m is an integer of 0, 1, 2 or 3.
Claim 3
Dependent Claim
116 words
An electrophotographic photoconductor comprising an electroconductive support material and a photosensitive layer comprising at least one stilbene derivative of the formula ##STR906## wherein R 1 represents an unsubstituted or substituted phenoxy group, R 2 represents hydrogen, a lower alkyl group or an unsubstituted or substituted phenyl group; Ar represents ##STR907## or a 9-anthryl group, R 3 represents hydrogen, an alkyl group, an alkoxy group, halogen or substituted amino group represented by ##STR908## in which R 4 and R 5 each represent an alkyl group, an unsubstituted or substituted aralkyl group, or an unsubstituted or substituted aryl group, m is an integer of 0, 1, 2 or 3 and n is an integer of 0 or 1.
Claim 4
Dependent Claim
116 words
An electrophotographic photoconductor comprising an electroconductive support material and a photosensitive layer comprising at least one stilbene derivative of the formula ##STR906## wherein R 1 represents an unsubstituted or substituted phenoxy group, R 2 represents hydrogen, a lower alkyl group or an unsubstituted or substituted phenyl group; Ar represents ##STR907## or a 9-anthryl group, R 3 represents hydrogen, an alkyl group, an alkoxy group, halogen or substituted amino group represented by ##STR908## in which R 4 and R 5 each represent an alkyl group, an unsubstituted or substituted aralkyl group, or an unsubstituted or substituted aryl group, m is an integer of 0, 1, 2 or 3 and n is an integer of 0 or 1.
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) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |