US3554742A
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US
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Electrophotographic element containing a barrier layer comprising block copolycarbonates
Assignee: Eastman Kodak Co
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Filing: 1970-02-18
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Granted: 1971-01-12
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Expires: 1990-02-18
Abstract
Abstract ELECTROPHOTOGRAPHIC ELEMENTS COMPRISED OF A SUPPORT, AN ELECTRICALLY CONDUCTING LAYER, A NOVEL BARRIER LAYER AND A PHOTOCONDUCTIVE INSULATING LAYER. THE NOVEL BARRIER LAYERS ARE FORMED OF BLOCK COPOLYCARBONATES HAVE ONE RECURRING UNIT CONTAINING AN ALKYLIDENE DIARYLENE MOIETY AND ANOTHER RECURRING UNIT CONTAINING AN OXYTETRAMETHYLENE MOIETY THESE BARRIER LAYERS HAVE IMPROVED ADHESION WITH CONTIGUOUS LAYERS.
Inventors
- 👤 Eugene P Gramza
- 👤 Edmond S Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:06
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/142
Claims Analysis
Total Claims: 0
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |