Patent US3824099A successfully refreshed from Google Patents.
US3824099A
Expired / Lapsed
US
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Sensitive electrophotographic plates
Assignee: International Business Machines Corp
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Filing: 1973-01-15
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Granted: 1974-07-16
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Expires: 1993-01-15
Abstract
Abstract VERY SENSITIVE ELECTROPHOTOGRAPHIC PLATES ARE PROVIDED HAVING A CHARGE GENERATING LAYER COMPRISING A SQUARIC ACID METHINE DYE AND A CHARGE TRANSPORT LAYER COMPRISING A TRI-ARYL PYRAZOLINE COMPOUND.
Inventors
- 👤 R Champ
- 👤 M Shattuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:34
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0618; G03G5/0609; G03G5/0611; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0631
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |