US3647432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbazolylmethane dye salts as sensitizers for photoconductor compositions
Assignee: Individual
•
Filing: 1969-10-22
•
Granted: 1972-03-07
•
Expires: 1989-10-22
Abstract
Abstract Tris(9-alkylcarbazol-3-y1)methane dyes and tris(9-arylcarbazol3-y1)methane dyes enhance the sensitization of photoconductive layers containing various photoconductors. These materials are particularly useful in elements used in electrophotographic processes.
Inventors
- 👤 Colin Holstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:30
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/26; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0644; G03G5/0661; G03G5/0664
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
12 words
The element of claim 1 wherein the photoconductor is an organic photoconductor.
Claim 2
Dependent Claim
29 words
An electrophotographic element comprising a support having coated thereon a layer of a photoconductive composition comprising a polymeric film-forming binder, an organic photoconductor and a sensitizer having the formula:
Claim 3
Dependent Claim
11 words
The element of claim 3 wherein R1 is an alkyl group.
Claim 4
Dependent Claim
11 words
The element of claim 3 wherein R1 is an aryl group.
Claim 5
Dependent Claim
21 words
The element of claim 3 wherein the organic photoconductor is selected from the group consisting of an N-arylcarbazole and an N-alkylcarbazole.
Claim 6
Dependent Claim
69 words
An electrophotographic element comprising a support having coated thereon a layer of a photoconductive composition comprising: a. from about 10 percent to about 60 percent by weight based on said photoconductive composition of an organic photoconductor, b. a film-forming polymeric binder for said photoconductor and c. from about 0.005 percent to about 5 percent by weight based on said photoconductive composition of a sensitizer comprising a tris(9-methylcarbazol-3-yl)methane dye salt.
Claim 7
Dependent Claim
13 words
The element of claim 7 wherein the organic photoconductor is an N-methyl carbazole.
Claim 8
Dependent Claim
69 words
An electrophotographic element comprising a support having coated thereon a layer of a photoconductive composition comprising: a. from about 10 percent to about 60 percent by weight based on said photoconductive composition of an organic photoconductor, b. a film-forming polymeric binder for said photoconductor and c. from about 0.005 percent to about 5 percent by weight based on said photoconductive composition of a sensitizer comprising a tris(9-ethylcarbazol-3-yl)methane dye salt.
Claim 9
Dependent Claim
13 words
The element of claim 9 wherein the organic photoconductor is an N-ethyl carbazole.
Claim 10
Dependent Claim
24 words
A photoconductive composition comprising a photoconductor and a sensitizer selected from the group consisting of a tris(9-alkylcarbazol-3-yl)methane dye salt and a tris(9-arylcarbazol-3-yl)methane dye salt.
Claim 11
Dependent Claim
12 words
The composition of claim 11 wherein the photoconductor is an organic photoconductor.
Claim 12
Dependent Claim
17 words
The composition of claim 11 further comprising a polymeric film-forming binder for said photoconductor and said sensitizer.
Claim 13
Dependent Claim
26 words
A photoconductive composition comprising an N-substituted carbazole photoconductor and a sensitizer selected from the group consisting of a tris(9-alkylcarbazol-3-yl)methane dye salt and a tris(9-arylcarbazol-3-yl)methane dye salt.
Claim 14
Dependent Claim
48 words
In an electrophotographic process where an electrostatic charge pattern is formed on an electrophotographic element, the improvement characterized in that said photoconductive element has a photoconductive layer comprising a photoconductor and a sensitizer selected from the group consisting of a tris(9-alkylcarbazol-3-yl)methane dye salt and a tris(9-arylcarbazol-3-yl)methane dye salt.
References Cited (Backward Citations)
US3448705A
Cited
US3503740A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |