Patent US3071645A successfully refreshed from Google Patents.
US3071645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recorder utilizing electrostatic charges
Assignee: General Dynamics Corp
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Filing: 1959-09-09
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Granted: 1963-01-01
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Expires: 1979-09-09
Abstract
No abstract record available.
Inventors
- 👤 Joseph T Mcnaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE METHOD OF PRINTING COMPRISING THE STEPS OF POSITIONING ON A CONDUCTIVE BACKING MEMBER A PHOTOCONDUCTIVE INSULATING SURFACE HAVING THEREON A UNIFORM CHARGE OF ONE POLARITY, DEPOSITING AN OPPOSITELY CHARGED UNIFORM FILM OF FINELY-DIVIDED POWDER MATERIAL ON SAID PHOTOCONDUCTIVE INSULATING SURFACE, BRINGING A PRINTING SHEET INTO PROXIMITY WITH THE POWDER-BEARING PHOTOCONDUCTIVE SURFACE, APPLYING A POTENTIAL OPPOSITE IN POLARITY TO SAID ONE POLARITY TO THE CONDUCTIVE BACKING MEMBER AND EXPOSING SELECTED PORTIONS OF SAID PHOTOCONDUCTIVE SURFACE TO THE INFLUENCE OF LIGHT AND THEREBY BREAKING THE ELECTROSTATIC ATTRACTION BETWEEN SAID EXPOSED PORTIONS OF SAID PHOTOCONDUCTIVE SURFACE AND SAID POWDER AND CAUSING THE POTENTIAL OF SAID CONDUCTIVE MEMBER TO REPEL THE POWDER ON SAID SELECTED PORTIONS OF SAID PHOTOCONDUCTIVE SURFACE ONTO SAID PRINTING SHEET.
Claim 2
Independent Claim
121 words
THE METHOD OF PRINTING COMPRISING THE STEPS OF POSITIONING ON A CONDUCTIVE BACKING MEMBER A PHOTOCONDUCTIVE INSULATING SURFACE HAVING THEREON A UNIFORM CHARGE OF ONE POLARITY, DEPOSITING AN OPPOSITELY CHARGED UNIFORM FILM OF FINELY-DIVIDED POWDER MATERIAL ON SAID PHOTOCONDUCTIVE INSULATING SURFACE, BRINGING A PRINTING SHEET INTO PROXIMITY WITH THE POWDER-BEARING PHOTOCONDUCTIVE SURFACE, APPLYING A POTENTIAL OPPOSITE IN POLARITY TO SAID ONE POLARITY TO THE CONDUCTIVE BACKING MEMBER AND EXPOSING SELECTED PORTIONS OF SAID PHOTOCONDUCTIVE SURFACE TO THE INFLUENCE OF LIGHT AND THEREBY BREAKING THE ELECTROSTATIC ATTRACTION BETWEEN SAID EXPOSED PORTIONS OF SAID PHOTOCONDUCTIVE SURFACE AND SAID POWDER AND CAUSING THE POTENTIAL OF SAID CONDUCTIVE MEMBER TO REPEL THE POWDER ON SAID SELECTED PORTIONS OF SAID PHOTOCONDUCTIVE SURFACE ONTO SAID PRINTING SHEET.
References Cited (Backward Citations)
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US2624652A
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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) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |