US2965481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic charging and image formation
Assignee: Xerox Corp
•
Filing: 1955-08-01
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Granted: 1960-12-20
•
Expires: 1975-08-01
Abstract
No abstract record available.
Inventors
- 👤 Robert W Gundlach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
THE METHOD, IN ELECTROSTATIC PHOTOGRAPHY, OF SENSITIZING A XEROGRAPHIC PLATE CONSISTING OF A SELF-SUPPORTING FILM OF PHOTOCONDUCTIVE INSULATING MATERIAL, SAID METHOD COMPRISING, IN DARKNESS, POSITIONING SAID PLATE BETWEEN A PAIR OF CORONA DISCHARGING SOURCES LOCATED IN SPACED RELATIONSHIP FACING AND DIRECTLY OPPOSITE TO EACH OTHER, APPLYING TO EACH OF SAID CORONA DISCHARGING SOURCES AN A.C. ELECTRIC POTENTIAL TO CREATE CORONA DISCHARGE THEREAT, CREATING AN ELECTRIC FIELD BETWEEN SAID SOURCES TO CAUSE IONS OF OPPOSITE POLARITY TO MOVE FROM FROM EACH OF SAID SOURCES TO EACH FACING SURFACE OF SAID PLATE BY APPLYING A POTENTIAL DIFFERENCE TO ONE OF SAID DISCHARGE SOURCES IN RESPECT TO THE OTHER OF SAID DISCHARGE SOURCES, SAID APPLIED ELECTRIC POTENTIALS, APPLIED TO EACH OF SAID SOURCES TO CREATE CORONA DISCHARGE AND APPLIED BETWEEN SAID SOURCES TO CREATE AN ELECTRIC FIELD THEREBETWEEN BEING SUFFICIENTLY INTENSE TO CAUSE PLATE CHARGING TO ABOVE ABOUT 150 VOLTS WHEN MEASURING ONE SURFACE IN RESPECT TO THE OTHER SURFACE OF SAID PLATE, AND WHILE SAID PLATE CONTINUES TO BE LOCATED BETWEEN SAID CARONA DISCHARGING SOURCES BRINGING ABOUT RELATIVE MOVEMENT BETWEEN SAID PLATE AND SAID SOURCES.
Claim 2
Independent Claim
183 words
THE METHOD, IN ELECTROSTATIC PHOTOGRAPHY, OF SENSITIZING A XEROGRAPHIC PLATE CONSISTING OF A SELF-SUPPORTING FILM OF PHOTOCONDUCTIVE INSULATING MATERIAL, SAID METHOD COMPRISING, IN DARKNESS, POSITIONING SAID PLATE BETWEEN A PAIR OF CORONA DISCHARGING SOURCES LOCATED IN SPACED RELATIONSHIP FACING AND DIRECTLY OPPOSITE TO EACH OTHER, APPLYING TO EACH OF SAID CORONA DISCHARGING SOURCES AN A.C. ELECTRIC POTENTIAL TO CREATE CORONA DISCHARGE THEREAT, CREATING AN ELECTRIC FIELD BETWEEN SAID SOURCES TO CAUSE IONS OF OPPOSITE POLARITY TO MOVE FROM FROM EACH OF SAID SOURCES TO EACH FACING SURFACE OF SAID PLATE BY APPLYING A POTENTIAL DIFFERENCE TO ONE OF SAID DISCHARGE SOURCES IN RESPECT TO THE OTHER OF SAID DISCHARGE SOURCES, SAID APPLIED ELECTRIC POTENTIALS, APPLIED TO EACH OF SAID SOURCES TO CREATE CORONA DISCHARGE AND APPLIED BETWEEN SAID SOURCES TO CREATE AN ELECTRIC FIELD THEREBETWEEN BEING SUFFICIENTLY INTENSE TO CAUSE PLATE CHARGING TO ABOVE ABOUT 150 VOLTS WHEN MEASURING ONE SURFACE IN RESPECT TO THE OTHER SURFACE OF SAID PLATE, AND WHILE SAID PLATE CONTINUES TO BE LOCATED BETWEEN SAID CARONA DISCHARGING SOURCES BRINGING ABOUT RELATIVE MOVEMENT BETWEEN SAID PLATE AND SAID SOURCES.
References Cited (Backward Citations)
US2732775A
Cited
US2297691A
Cited
US2588699A
Cited
US2624652A
Cited
US2588675A
Cited
US2663636A
Cited
US2693416A
Cited
US2701764A
Cited
US2777745A
Cited
US2885556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |