US3337339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen xerography
Assignee: Xerox Corp
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Filing: 1962-10-01
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Granted: 1967-08-22
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Expires: 1982-10-01
Abstract
No abstract record available.
Inventors
- 👤 Snelling Christopher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:54
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G15/00; G03G15/22; G03G15/28; G03G15/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A METHOD OF XEROGRAPHIC REPRODUCTION COMPRISING THE STEPS OF: (A) SUBSTANTIALLY UNIFORMLY ELECTROSTATICALLY CHARGING A XEROGRAPHIC PLATE COMPRISING AS AN INTEGRAL MEMBER AN OPTICAL SCREEN HAVING A MULTIPLICITY OF ALTERNATING DISCRETE OPTICALLY TRANSPARENT AND OPAQUE AREAS, A PHOTOCONDUCTIVE INSULATING LAYER, A FIRST SIDE OF WHICH IS ADJACENT TO SAID OPTICAL SCREEN, AND INCLUDING A CONDUCTIVE CONTACT WITH SAID FIRST SIDE OF SAID PHOTOCONDUCTIVE INSULATING LAYER, SAID CONTACT BEING OPTICALLY TRANSPARENT IN AT LEAST THOSE AREAS CORRESPONDING TO THE TRANSPARENT AREAS OF SAID OPTICAL SCREEN; (B) EXPOSING THE SECOND SIDE OF SAID PLATE TO A LIGHT IMAGE; (C) SUBSTANTIALLY UNIFORMLY EXPOSING THE FIRST SIDE OF SAID PHOTOCONDUCTIVE INSULATING LAYER TO A LIGHT SOURCE THROUGH SAID OPTICAL SCREEN AT SOME TIME BETWEEN THE LATER STAGE OF THE STEP OF SENSITIZING SAID PLATE TO THE EARLY STAGES OF THE SUBSEQUENT STEP OF DEVELOPING IN A MANNER SUCH THAT SAID TWO EXPOSURES ARE MADE TO OPPOSITE SIDES OF SAID PHOTOCONDUCTIVE INSULATING LAYER; AND, (D) DEVELOPING SAID PHOTOCONDUCTIVE INSULATING LAYER WITH FINELY DIVIDED ELECTROCOPIC MARKING MATERIAL.
Claim 2
Independent Claim
171 words
A METHOD OF XEROGRAPHIC REPRODUCTION COMPRISING THE STEPS OF: (A) SUBSTANTIALLY UNIFORMLY ELECTROSTATICALLY CHARGING A XEROGRAPHIC PLATE COMPRISING AS AN INTEGRAL MEMBER AN OPTICAL SCREEN HAVING A MULTIPLICITY OF ALTERNATING DISCRETE OPTICALLY TRANSPARENT AND OPAQUE AREAS, A PHOTOCONDUCTIVE INSULATING LAYER, A FIRST SIDE OF WHICH IS ADJACENT TO SAID OPTICAL SCREEN, AND INCLUDING A CONDUCTIVE CONTACT WITH SAID FIRST SIDE OF SAID PHOTOCONDUCTIVE INSULATING LAYER, SAID CONTACT BEING OPTICALLY TRANSPARENT IN AT LEAST THOSE AREAS CORRESPONDING TO THE TRANSPARENT AREAS OF SAID OPTICAL SCREEN; (B) EXPOSING THE SECOND SIDE OF SAID PLATE TO A LIGHT IMAGE; (C) SUBSTANTIALLY UNIFORMLY EXPOSING THE FIRST SIDE OF SAID PHOTOCONDUCTIVE INSULATING LAYER TO A LIGHT SOURCE THROUGH SAID OPTICAL SCREEN AT SOME TIME BETWEEN THE LATER STAGE OF THE STEP OF SENSITIZING SAID PLATE TO THE EARLY STAGES OF THE SUBSEQUENT STEP OF DEVELOPING IN A MANNER SUCH THAT SAID TWO EXPOSURES ARE MADE TO OPPOSITE SIDES OF SAID PHOTOCONDUCTIVE INSULATING LAYER; AND, (D) DEVELOPING SAID PHOTOCONDUCTIVE INSULATING LAYER WITH FINELY DIVIDED ELECTROCOPIC MARKING MATERIAL.
References Cited (Backward Citations)
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US2808328A
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US2756676A
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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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |