US3895945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of a dyestuff sensitized photoconductive composition
Assignee: Xerox Ltd
•
Filing: 1973-11-14
•
Granted: 1975-07-22
•
Expires: 1993-11-14
Abstract
Abstract WHEREIN R is alkyl of 1 to about 5 carbon atoms; and X is an anion residue. Such polymeric materials are highly effective sensitizers for organic photoconductors such as the poly(vinylcarbazoles). Process for preparation of polymeric dyestuffs of the formula:
Inventors
- 👤 Syu Watarai
- 👤 Yoshio Seoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:38
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/26; C09B69/00; C09B69/10; C09B69/103; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0644; G03G5/0661
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
24 words
A PROCESS FOR PREPARATION OF A DYESTUFF SENSTIZED PHOTOCONDUCIVE COMPOSISTION FROM AN ORGANIC POLYMERIC PHOTOCONDUCTIVE MATERIAL, POLYHOSPHORIC ACID AND A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
24 words
A PROCESS FOR PREPARATION OF A DYESTUFF SENSTIZED PHOTOCONDUCIVE COMPOSISTION FROM AN ORGANIC POLYMERIC PHOTOCONDUCTIVE MATERIAL, POLYHOSPHORIC ACID AND A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
13 words
The process of claim 1, wherein the organic polymeric photoconductive material is poly(N-vinylcarbazole).
Claim 4
Dependent Claim
13 words
The process of claim 1, wherein the organic polymeric photoconductive material is poly(3-vinylcarbazole).
Claim 5
Dependent Claim
13 words
The process of claim 1, wherein the organic polymeric photoconductive material is poly(2-vinylcarbazole).
Claim 6
Dependent Claim
13 words
The process of claim 1, wherein the organic polymeric photoconductive material is poly(vinylpryene).
Claim 7
Dependent Claim
13 words
The process of claim 1, wherein the organic polymeric photoconductive material is poly(vinylpyrenal).
Claim 8
Dependent Claim
16 words
The process of claim 1, wherein the compound of the above structural formula is N-methyl-3-formyl carbazole.
Claim 9
Dependent Claim
16 words
The process of claim 1, wherein the compound of the above structural formula is N-ethyl-3-formyl carbazole.
Claim 10
Dependent Claim
30 words
The process of claim 1, wherein heating of the mixture proceeds for an interval sufficient to produce a composition wherein the predominent component is triaryl methane dyestuff of the formula
Claim 11
Dependent Claim
44 words
The process of claim 1, wherein heating of the mixture proceeds for an interval sufficient to produce a composition wherein the predominent component is a polymeric triaryl methane dyestuff of the formula wherein X is an anion residue and R is as previously defined
Claim 12
Dependent Claim
30 words
The process of claim 1 wherein a solution of the polymeric products of step (b) is exposed to activating electromagnetic radiation for a duration sufficient to enhance its optical density.
References Cited (Backward Citations)
US3647432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |