Patent US3057787A successfully refreshed from Google Patents.
US3057787A
Expired / Lapsed
US
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Photoconductography employing alkaline dye formation
Assignee: Eastman Kodak Co
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Filing: 1960-07-28
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Granted: 1962-10-09
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Expires: 1980-07-28
Abstract
No abstract record available.
Inventors
- 👤 John J Sagura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:39
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/02; Y; Y10; Y10S; Y10S101/00; Y10S101/29; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A PHOTOCONDUCTOGRAPHIC PROCESS IN WHICH A PRINT IS MADE ON A PHOTOCONDUCTIVE LAYER IN WHICH AN IMAGE PATTERN OF VARIATIONS IN ELECTRICAL CONDUCTIVITY HAS BEEN PRODUCED BY EXPOSURE TO LIGHT, THE STEPS COMPRISING PLACING THE LAYER IN CONTACT WITH AN AQUEOUS ELECTROLYTE CONTAINING MAGNESIUM IONS, PASSING ELE CTRIC CURRENT THROUGH THE LAYER AS CATHODE, DISTRIBUTED IN ACCORDANCE WITH SAID PATTERN TO DEPOSIT MAGNESIUM HYDROXIDE ON THE LAYER SIMILARLY DISTRIBUTED AND APPLYING TO THE MAGNESIUM HYDROXIDE A REAGANT WHICH FORMS A DYE AT THE ALKALINE PH OF THE MAGNESIUM HYDROXIDE.
Claim 2
Dependent Claim
90 words
IN A PHOTOCONDUCTOGRAPHIC PROCESS IN WHICH A PRINT IS MADE ON A PHOTOCONDUCTIVE LAYER IN WHICH AN IMAGE PATTERN OF VARIATIONS IN ELECTRICAL CONDUCTIVITY HAS BEEN PRODUCED BY EXPOSURE TO LIGHT, THE STEPS COMPRISING PLACING THE LAYER IN CONTACT WITH AN AQUEOUS ELECTROLYTE CONTAINING MAGNESIUM IONS, PASSING ELE CTRIC CURRENT THROUGH THE LAYER AS CATHODE, DISTRIBUTED IN ACCORDANCE WITH SAID PATTERN TO DEPOSIT MAGNESIUM HYDROXIDE ON THE LAYER SIMILARLY DISTRIBUTED AND APPLYING TO THE MAGNESIUM HYDROXIDE A REAGANT WHICH FORMS A DYE AT THE ALKALINE PH OF THE MAGNESIUM HYDROXIDE.
References Cited (Backward Citations)
US571531A
Cited
US2306471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |