US3057720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic color reproduction
Assignee: Xerox Corp
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Filing: 1959-05-04
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Granted: 1962-10-09
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Expires: 1979-05-04
Abstract
No abstract record available.
Inventors
- 👤 Richard E Hayford
- 👤 Carl B Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:25
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
254 words
THE METHOD OF XEROGRAPHIC COLOR REPRODUCTION WHEREIN A XEROGRAPHIC PICTURE IS PRODUCED BY DEPOSITION OF A PLURALITY OF COLORED MATERIALS ON CHARGE PATTERNS FORMED BY THE COMBINED ACTION OF AN ELECTRIC FIELD AND A POSITIVE COLOR TRANSPARENCY ON A PHOTOCONDUCTIVE INSULATING LAYER ON A CONDUCTIVE BACKING, SAID METHOD COMPRISING APPLYING A UNIFORM ELECTRIC CHARGE OF GIVEN POLARITY TO THE FREE SURFACE OF THE PHOTOCONDUCTIVE INSULATING LAYER, EXPOSING SAID SURFACE TO BLUE LIGHT PROJECTED THROUGH A POSITIVE COLOR TRANSPARENCY ONTO SAID SURFACE, POSITIONING SAID SURFACE IN CLOSE PARALLEL SPACED RELATION TO A CONDUCTIVE ELECTRODE, BRINGING SAID ELECTRODE TO A POTENTIAL SUBSTANTIALLY EQUAL TO THAT OF THE CONDUCTIVE BACKING OF THE PHOTOCONDUCTIVE INSULATING LAYER, ELECTROSTATICALLY CHARGING A SUSPENSION OF FINELY DIVIDED BLUE POWDER ADAPTED TO FORM A LATERALLY RESISTIVE LAYER TO A POLARITY OPPOSITE THAT OF THE PHOTOCONDUCTIVE SURFACE, PASSING SAID SUSPENSION BETWEEN THE PHOTOCONDUCTIVE INSULATING LAYER AND THE ADJACENT CONDUCTIVE ELECTRODE, REAPPLYING BY CORONA A UNIFORM ELECTRIC CHARGE OF SAID GIVEN POLARITY TO THE SURFACE OF THE PHOTOCONDUCTIVE INSULATING LAYER, RE-EXPOSING SAID SURFACE IN REGISTER TO GREEN LIGHT PROJECTED THROUGH THE POSITIVE COLOR TRANSPARENCY ONTO SAID SURFACE, REPOSITIONING SAID SURFACE IN CLOSE PARALLEL SPACED RELATION TO SAID CONDUCTIVE ELECTRODE, BRINGING SAID ELECTRODE TO A POTENTIAL SUBSTANTIALLY EQUAL TO THAT OF THE CONDUCTIVE BACKING OF THE PHOTOCONDUCTIVE INSULATING LAYER, ELECTROSTATICALLY CHARGING A SUSPENSION OF FINELY DIVIDED MAGENTA POWDER ADAPTED TO FORM A LATERALLY RESISTIVE LAYER TO A POLARITY OPPOSITE THAT OF THE PHOTOCONDUCTIVE SURFACE, PASSING SAID SUSPENSION BETWEEN THE PHOTOCONDUCTIVE INSULATING LAYER AND THE ADJACENT CON-
Claim 2
Independent Claim
254 words
THE METHOD OF XEROGRAPHIC COLOR REPRODUCTION WHEREIN A XEROGRAPHIC PICTURE IS PRODUCED BY DEPOSITION OF A PLURALITY OF COLORED MATERIALS ON CHARGE PATTERNS FORMED BY THE COMBINED ACTION OF AN ELECTRIC FIELD AND A POSITIVE COLOR TRANSPARENCY ON A PHOTOCONDUCTIVE INSULATING LAYER ON A CONDUCTIVE BACKING, SAID METHOD COMPRISING APPLYING A UNIFORM ELECTRIC CHARGE OF GIVEN POLARITY TO THE FREE SURFACE OF THE PHOTOCONDUCTIVE INSULATING LAYER, EXPOSING SAID SURFACE TO BLUE LIGHT PROJECTED THROUGH A POSITIVE COLOR TRANSPARENCY ONTO SAID SURFACE, POSITIONING SAID SURFACE IN CLOSE PARALLEL SPACED RELATION TO A CONDUCTIVE ELECTRODE, BRINGING SAID ELECTRODE TO A POTENTIAL SUBSTANTIALLY EQUAL TO THAT OF THE CONDUCTIVE BACKING OF THE PHOTOCONDUCTIVE INSULATING LAYER, ELECTROSTATICALLY CHARGING A SUSPENSION OF FINELY DIVIDED BLUE POWDER ADAPTED TO FORM A LATERALLY RESISTIVE LAYER TO A POLARITY OPPOSITE THAT OF THE PHOTOCONDUCTIVE SURFACE, PASSING SAID SUSPENSION BETWEEN THE PHOTOCONDUCTIVE INSULATING LAYER AND THE ADJACENT CONDUCTIVE ELECTRODE, REAPPLYING BY CORONA A UNIFORM ELECTRIC CHARGE OF SAID GIVEN POLARITY TO THE SURFACE OF THE PHOTOCONDUCTIVE INSULATING LAYER, RE-EXPOSING SAID SURFACE IN REGISTER TO GREEN LIGHT PROJECTED THROUGH THE POSITIVE COLOR TRANSPARENCY ONTO SAID SURFACE, REPOSITIONING SAID SURFACE IN CLOSE PARALLEL SPACED RELATION TO SAID CONDUCTIVE ELECTRODE, BRINGING SAID ELECTRODE TO A POTENTIAL SUBSTANTIALLY EQUAL TO THAT OF THE CONDUCTIVE BACKING OF THE PHOTOCONDUCTIVE INSULATING LAYER, ELECTROSTATICALLY CHARGING A SUSPENSION OF FINELY DIVIDED MAGENTA POWDER ADAPTED TO FORM A LATERALLY RESISTIVE LAYER TO A POLARITY OPPOSITE THAT OF THE PHOTOCONDUCTIVE SURFACE, PASSING SAID SUSPENSION BETWEEN THE PHOTOCONDUCTIVE INSULATING LAYER AND THE ADJACENT CON-
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) | 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 |