US3713820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic charge transport layer
Assignee: International Business Machines Corp
•
Filing: 1971-09-07
•
Granted: 1973-01-30
•
Expires: 1991-09-07
Abstract
Abstract AN ELECTROPHOTOGRAPHIC PLATE IN WHICH THE PHOTOCONDUCTOR IS OVERCOATED WITH A CHARGE TRANSPORT LAYER OF POLYAMIDE WHICH IS FORMED FROM LINOLEIC ACID AND ETHYLENE DIAMINE AND WHICH HAS A RESISTIVITY OF AT LEAST 10**10 OHM CM. AND A DARK DECAY TIME OF LESS THAN TEN SECONDS.
Inventors
- 👤 R Champ
- 👤 A Cherry
- 👤 M Shattuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:40
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/043; G03G5/047; G03G5/0436; G03G5/05; G03G5/0528; G03G5/0557; G03G5/0571
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |