US3615384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic process employing vinyl bithiophene polymeric photoconductors
Assignee: International Business Machines Corp
•
Filing: 1970-06-29
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Granted: 1971-10-26
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Expires: 1990-06-29
Abstract
Abstract Photoconductors comprising vinyl bithiophene polymers and their use in electrophotographic processes.
Inventors
- 👤 Edward Gipstein
- 👤 William A Hewett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:27
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/071; C; C08; C08F; C08F28/00; C08F28/06; C08F8/00; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
21 words
A process as claimed in claim 1 wherein the photoconductor comprises a vinyl bithiophene polymer complexed with an electron accepting compound.
Claim 2
Dependent Claim
14 words
A process as claimed in claim 2 wherein the electron accepting compound is 2,4,7-trinitrofluorenone.
Claim 3
Dependent Claim
15 words
A process as claimed in claim 3 wherein the electron accepting compound is tetrabromophthalic anhydride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |