US3791824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conjugated polymers in electrophotography
Assignee: International Business Machines Corp
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Filing: 1973-02-20
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Granted: 1974-02-12
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Expires: 1993-02-20
Abstract
Abstract Poly-2,9-methylenefluorene, fully conjugated via 9methylenefluorene repeating units, has been found to be a useful photoconductor in electrophotographic processes.
Inventors
- 👤 W Bauer
- 👤 Westerhoff U Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:04
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/075; G03G5/076; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
16 words
A process as claimed in claim 1 wherein the photoconductor also comprises an electron accepting activator.
Claim 2
Dependent Claim
12 words
A process as claimed in claim 2 wherein the activator is 9-dicyanomethylene-2,4,7-trinitrofluorene.
Claim 3
Dependent Claim
13 words
A process as claimed in claim 2 wherein the activator is 2,4, 7-trinitro-9-fluorenone.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |