Patent US3837851A successfully refreshed from Google Patents.
US3837851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductor overcoated with triarylpyrazoline charge transport layer
Assignee: International Business Machines Corp
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Filing: 1973-01-15
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Granted: 1974-09-24
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Expires: 1993-01-15
Abstract
Abstract Electrophotographic plates are provided having a charge generation layer and a separate charge transport layer comprising a tri-aryl pyrazoline compound having the formula: WHEREIN N IS ZERO OR ONE, AND A, A1 and A2 are each aryl radicals.
Inventors
- 👤 M Shattuck
- 👤 W Weiche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:00
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/043; G03G5/0436; G03G5/047; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0631; G03G5/0664; G03G5/0666; G03G5/0668; G03G5/067
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
11 words
A process as claimed in claim 1 wherein n is one.
Claim 2
Dependent Claim
15 words
A process as claimed in claim 1 wherein the overcoat layer comprises a resin binder.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1 wherein the overcoating layer comprises the compound 1-phenyl-3-(p-diethylaminostyryl)-5-(p-diethylamino phenyl)-pyrazoline.
References Cited (Backward Citations)
US3180729A
Cited
GB1030024A
Cited
US3384488A
Cited
US3527602A
Cited
US3598582A
Cited
US3535221A
Cited
US3549362A
Cited
US3684548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |