US3752668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic photoconductive members comprising dicyanomethylene substituted fluorene sensitizers
Assignee: AB Dick Co
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Filing: 1969-06-05
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Granted: 1973-08-14
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Expires: 1989-06-05
Abstract
Abstract ORGANIC PHOTOCONDUCTIVE SYSTEMS WHICH EMPLOY ORGANIC POLYMERS CONTAINING AROMATIC OR HETEROCYCLIC NUCLEI ARE COMBINED WITH AMOUNTS OF $ ACID TYPE ADDITIVES FOR THE PURPOSE OF EXTENDING THE SPECTRAL RESPONSE TO THE VISIBLE PORTION OF THE SPECTRUM. THE SENSITIZING COMPOUNDS ARE DIICYANOMETHYLENE SUBSTITUTED FLUORENES WHICH ARE ADDED IN AN AMOUNT EXPRESSED IN MOLES OF SENSITIZER PER 100 MOLES OF THE ORGANIC PHOTOCONDUCTOR CALCULATED AS THE MONOMER. THE AMOUNT OF SENSITIZER TO BE ADDED MAY RANGE FROM 0.1 TO ABOUT 100 MOLES PER 100 MOLES OF ORGANIC PHOTOCONDUCTOR BASED ON THE MOLECULAR WEIGHT OF THE MONOMER.
Inventors
- 👤 E Baltazzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:52
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0612; G03G5/0603; G03G5/0605; G03G5/0607; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/10
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |