Patent US3220324A successfully refreshed from Google Patents.
US3220324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductively controlled corona charging
Assignee: Xerox Corp
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Filing: 1963-11-12
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Granted: 1965-11-30
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Expires: 1983-11-12
Abstract
No abstract record available.
Inventors
- 👤 Snelling Christopher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/05; G03G15/051
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
APPARATUS FOR FORMING AN ELECTROSTATIC CHARGE PATTERN CONFORMING TO AN OPTICAL IMAGE ON A CHARGEABLE MEMBER INCLUDING: A CORONA DISCHARGE DEVICE DISPOSED IN CHARGING RELATION TO THE CHARGEABLE MEMBER; MEANS, INCLUDING, AN ELECTRICALLY CONDUCTIVE SCREEN HAVING A PHOTOCONDUCTIVE LAYER THEREON AND A SOURCE OF ELECTRICAL POTENTIAL CONNECTED SAID SCREEN TO SELECTIVELY PREVENT CHARGING OF THE CHARGEABLE MEMBER WHEN AN OPTICAL IMAGE IS FOCUSED ON SAID PHOTOCONDUCTIVE LAYER; MEANS TO FOCUS AN OPTICAL IMAGE ON SAID PHOTOCONDUCTIVE LAYER; AND, MEANS TO ENERGIZE SAID CORONA DEVICE WHEN AN OPTICAL IMAGE IS FOCUSED ON SAID PHOTOCONDUCTIVE LAYER.
Claim 2
Dependent Claim
94 words
APPARATUS FOR FORMING AN ELECTROSTATIC CHARGE PATTERN CONFORMING TO AN OPTICAL IMAGE ON A CHARGEABLE MEMBER INCLUDING: A CORONA DISCHARGE DEVICE DISPOSED IN CHARGING RELATION TO THE CHARGEABLE MEMBER; MEANS, INCLUDING, AN ELECTRICALLY CONDUCTIVE SCREEN HAVING A PHOTOCONDUCTIVE LAYER THEREON AND A SOURCE OF ELECTRICAL POTENTIAL CONNECTED SAID SCREEN TO SELECTIVELY PREVENT CHARGING OF THE CHARGEABLE MEMBER WHEN AN OPTICAL IMAGE IS FOCUSED ON SAID PHOTOCONDUCTIVE LAYER; MEANS TO FOCUS AN OPTICAL IMAGE ON SAID PHOTOCONDUCTIVE LAYER; AND, MEANS TO ENERGIZE SAID CORONA DEVICE WHEN AN OPTICAL IMAGE IS FOCUSED ON SAID PHOTOCONDUCTIVE LAYER.
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 |