Patent US3220939A successfully refreshed from Google Patents.
US3220939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductography employing manganese compounds
Assignee: Eastman Kodak Co
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Filing: 1963-04-08
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Granted: 1965-11-30
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Expires: 1983-04-08
Abstract
No abstract record available.
Inventors
- 👤 Raymond F Reithel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:25
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
IN A PHOTOCONDUCTOGRAPHIC PROCESS IN WHICH AN IMAGE PATTERN OF VARIATIONS IN ELECTRICAL CONDUCTIVITY IS PRODUCED IN A PHOTOCONDUCTIVE LAYER, THE STEPS COMPRISING ELECTROLYTICALLY DEPOSITING ON THE SURFACE OF SAID LAYER AN IMAGEWISE DISTRIBUTION OF HYDROXIDE CONTAINING POSITIVE MANGANESE IONS AND REACTING SAID IONS WITH A WATER SOLUBLE SILVER SALT.
Claim 2
Dependent Claim
50 words
IN A PHOTOCONDUCTOGRAPHIC PROCESS IN WHICH AN IMAGE PATTERN OF VARIATIONS IN ELECTRICAL CONDUCTIVITY IS PRODUCED IN A PHOTOCONDUCTIVE LAYER, THE STEPS COMPRISING ELECTROLYTICALLY DEPOSITING ON THE SURFACE OF SAID LAYER AN IMAGEWISE DISTRIBUTION OF HYDROXIDE CONTAINING POSITIVE MANGANESE IONS AND REACTING SAID IONS WITH A WATER SOLUBLE SILVER SALT.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |