Patent EP0034438A1 successfully refreshed from Google Patents.
Patent US3684506A successfully refreshed from Google Patents.
US3684506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimeric poly-n-vinyl carbazole organic photoconductor and photoconductive elements embodying same
Assignee: ANTHONY J GUARNACCIO
•
Filing: 1970-08-24
•
Granted: 1972-08-15
•
Expires: 1990-08-24
Abstract
Abstract THE INVENTION IS ADDRESSED TO THE PREPARATION OF AN ELECTROPHOTOGRAPHIC ELEMENT HAVING A PHOTOCONDUCTIVE LAYER FORMULATED OF AN ORANIC PHOTOCONDUCTOR IN THE FORM OF AN ALKENYL CARBAZOLE DIMER AND IN WHICH THE ELECTROPHOTOGRAPHIC ELEMENT CAN BE PROCESSED FOR IMAGING PURPOSES IN THE CONVENTIONAL MANNER FOR ELECTROSTATIC PRINTING.
Inventors
- 👤 Anthony J Guarnaccio
- 👤 Robert N Dreyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:36
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0605; G03G5/0607; G03G5/0622; G03G5/0644; G03G5/0661
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |