US3984378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing nitropyrene-formaldehyde resin
Assignee: Ricoh Co Ltd
•
Filing: 1974-03-12
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Granted: 1976-10-05
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Expires: 1994-03-12
Abstract
Abstract Photoconductive, film forming nitropyrene-formaldehyde resins characterized by a repeating structural unit of the formula: ##SPC1## And process for preparation, the photoconductive films themselves, and such films on an electrically conductive support.
Inventors
- 👤 Tomio Kubota
- 👤 Shoji Maruyama
- 👤 Takao Igawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:41
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/075; G03G5/076; G03G5/0763; C; C07; C07C; C07C2603/00; C07C2603/02; C07C2603/40; C07C2603/42; C07C2603/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
15 words
A photoconductive, film forming resin wherein the repeating structural unit is of the formula: ##SPC4##
Claim 2
Dependent Claim
15 words
A photoconductive, film forming resin wherein the repeating structural unit is of the formula: ##SPC4##
Claim 3
Dependent Claim
14 words
A photoconductive resin of the formula: ##SPC5## wherein n is from 2 to 6.
Claim 4
Dependent Claim
14 words
A photoconductive resin of the formula: ##SPC5## wherein n is from 2 to 6.
Claim 5
Dependent Claim
21 words
A photoconductive film comprising as the principal photoconductive component a resin wherein the repeating structural unit is of the formula: ##SPC6##
Claim 6
Dependent Claim
21 words
A photoconductive film comprising as the principal photoconductive component a resin wherein the repeating structural unit is of the formula: ##SPC6##
Claim 7
Dependent Claim
15 words
A photoconductive film comprising as the principal photoconductive component a resin of the formula: ##SPC7##
Claim 8
Dependent Claim
15 words
A photoconductive film comprising as the principal photoconductive component a resin of the formula: ##SPC7##
Claim 9
Dependent Claim
27 words
A process for producing a photoconductive, film forming resin wherein the repeating structural unit is represented by the formula: ##SPC8## which comprises condensation polymerization of nitropyrene and
Claim 10
Dependent Claim
27 words
A process for producing a photoconductive, film forming resin wherein the repeating structural unit is represented by the formula: ##SPC8## which comprises condensation polymerization of nitropyrene and
Claim 11
Dependent Claim
23 words
A process as in claim 5, wherein the condensation reaction is carried out in a solvent selected from the group consisting of tetrahydrofuran,
Claim 12
Dependent Claim
31 words
A process as in claim 5 employing a catalyst selected from the group consisting of sulfuric acid, hydrochloric acid, phosphoric acid, phthalic acid, zinc chloride, sodium hydroxide, potassium hydroxide and organic
Claim 13
Dependent Claim
23 words
A process as in claim 5, wherein the condensation reaction is carried out in glacial acetic acid employing zinc chloride as a catalyst.
References Cited (Backward Citations)
US3740218A
Cited
US3842038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |