US3240597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconducting polymers for preparing electrophotographic materials
Assignee: Eastman Kodak Co
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Filing: 1961-08-21
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Granted: 1966-03-15
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Expires: 1981-08-21
Abstract
No abstract record available.
Inventors
- 👤 Charles J Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:29
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/075; G03G5/076
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
AN ELECTROPHOTOGRAPHIC PROCESS COMPRISING THE STEPS OF EXPOSING AN ELECTROSTATICALLY CHARGED PHOTOCONDUCTIVE INSULATING LAYER TO A LIGHT PATTERN TO FORM AN ELECTROSTATIC IMAGE ON SAID LAYER AND DEVELOPING THE IMAGE ON SAID LAYER BY APPLYING ELECTROSTATICALLY ATTRACTABLE PARTICULATE MATERIAL, SAID PHOTOCINDUCTIVE INSULATING LAYER COMPRISING A PHOTOCONDUCTIVE, LOW MOLECULAR WEIGHT CONDENSATION POLYMER OF FORMALDEHYDE AND A POLYNUCLEAR AROMATIC MONOMER SELECTED FROM THE GROUP CONSISTING OF (A) ANTHRACENE, NAPHTHALENE, ACENAPHTHALENE AND SUBSTITUTION PRODUCTS THEREOF WHEREIN SAID SUBSTITUENTS ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL, ALKOXY, AND HYDROXY, AND (B) N-ALKYL CARBAZOLE, N-PHENYL CARBAZOLE AND SUBSTITUTION PRODUCTS THEREOF WHEREIN SAID SUBSTITUENTS ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL, ALKOXY, CARBALKOXY, AND HYDROXY.
Claim 2
Dependent Claim
111 words
AN ELECTROPHOTOGRAPHIC PROCESS COMPRISING THE STEPS OF EXPOSING AN ELECTROSTATICALLY CHARGED PHOTOCONDUCTIVE INSULATING LAYER TO A LIGHT PATTERN TO FORM AN ELECTROSTATIC IMAGE ON SAID LAYER AND DEVELOPING THE IMAGE ON SAID LAYER BY APPLYING ELECTROSTATICALLY ATTRACTABLE PARTICULATE MATERIAL, SAID PHOTOCINDUCTIVE INSULATING LAYER COMPRISING A PHOTOCONDUCTIVE, LOW MOLECULAR WEIGHT CONDENSATION POLYMER OF FORMALDEHYDE AND A POLYNUCLEAR AROMATIC MONOMER SELECTED FROM THE GROUP CONSISTING OF (A) ANTHRACENE, NAPHTHALENE, ACENAPHTHALENE AND SUBSTITUTION PRODUCTS THEREOF WHEREIN SAID SUBSTITUENTS ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL, ALKOXY, AND HYDROXY, AND (B) N-ALKYL CARBAZOLE, N-PHENYL CARBAZOLE AND SUBSTITUTION PRODUCTS THEREOF WHEREIN SAID SUBSTITUENTS ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL, ALKOXY, CARBALKOXY, AND HYDROXY.
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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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |