Patent US4885792A successfully refreshed from Google Patents.
Patent US3227076A successfully refreshed from Google Patents.
US3227076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductography employing reducing agents
Assignee: Eastman Kodak Co
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Filing: 1960-07-28
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Granted: 1966-01-04
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Expires: 1980-07-28
Abstract
No abstract record available.
Inventors
- 👤 Jr John W Castle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:41
CPC Classifications
G; G03; G03G; G03G7/00; G03G17/00; G03G17/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A PHOTOCONDUCTOGRAPHY PROCESS IN WHICH AN IMAGE PATTERN OF VARIATIONS IN ELECTRICAL CONDUCTIVITY ARE PRODUCTED IN A PHOTOCONDUCTIVE ELECTRODE LAYER, THE STEPS COMPRISING ELECTROLYTICALLY CATHODICALLY DEPOSITING OF THE ELECTRODE LAYER, A SPONGY METALLIC HYDROXIDE IMAGE DISTRIBUTED IN ACCORDANCE WITH SAID PATTERN, APPLYING TO THE SPONGY IMAGE A CHEMICAL REDUCING AGENT, PLACING SAID IMAGE WITH ITS REDUCING AGENT INTO FIRM CONTACT WITH THE SURFACE OF A SEPARATE RECEIVING SHEET TO TRANSFER REDUCING AGENT TO SAID SURFACE AND CHEMICALLY REDUCING, ON SAID SURFACE IN ACCORDANCE WITH THE PATTERN OF TRANSFERRED AGENT, A MATERIAL WHICH, UPON REDUCTION, CHANGES ITS COLOR CHARACTERISTICS.
Claim 2
Dependent Claim
99 words
IN A PHOTOCONDUCTOGRAPHY PROCESS IN WHICH AN IMAGE PATTERN OF VARIATIONS IN ELECTRICAL CONDUCTIVITY ARE PRODUCTED IN A PHOTOCONDUCTIVE ELECTRODE LAYER, THE STEPS COMPRISING ELECTROLYTICALLY CATHODICALLY DEPOSITING OF THE ELECTRODE LAYER, A SPONGY METALLIC HYDROXIDE IMAGE DISTRIBUTED IN ACCORDANCE WITH SAID PATTERN, APPLYING TO THE SPONGY IMAGE A CHEMICAL REDUCING AGENT, PLACING SAID IMAGE WITH ITS REDUCING AGENT INTO FIRM CONTACT WITH THE SURFACE OF A SEPARATE RECEIVING SHEET TO TRANSFER REDUCING AGENT TO SAID SURFACE AND CHEMICALLY REDUCING, ON SAID SURFACE IN ACCORDANCE WITH THE PATTERN OF TRANSFERRED AGENT, A MATERIAL WHICH, UPON REDUCTION, CHANGES ITS COLOR CHARACTERISTICS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |