US3740218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductive elements containing complexes of lewis acids and formaldehyde resins
Assignee: Eastman Kodak Co
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Filing: 1971-06-01
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Granted: 1973-06-19
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Expires: 1991-06-01
Abstract
Abstract CERTAIN FORMALDEHYDE RESINS ARE DISCLOSED WHICH FORM COMPLEXES WITTH LEWSI ACIDS SUCH AS TRINITROFLUORENONE TO PRODUCE PHOTTOCONDUCTIVE CONDUCTIONS AND ELEMENTS OF HIGH SPEED AND UTILITY FOR ELECTROSTATIC IMAGE FORMATION.
Inventors
- 👤 L Contois
- 👤 S Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:13
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/075; G03G5/076; 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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |