US3147415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging surfaces for xerography
Assignee: Research Laboratories of Australia Pty Ltd
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Filing: 1960-09-06
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Granted: 1964-09-01
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Expires: 1980-09-06
Abstract
No abstract record available.
Inventors
- 👤 Oliphant Keith Meredith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:15
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
IN A XEROGRAPHIC PROCESS IN WHICH A LAYER OF PHOTOCONDUCTOR MATERIAL IS CHARGED IN THE ABSENCE OF ILLUMINATION AND SUBSEQUENTLY EXPOSED TO PRODUCE A CHARGE PATTERN ON THE PHOTOCONDUCTOR, THE CHARGING METHOD COMPRISING: APPLYING A LAYER OF PHOTOCONDUCTOR MATERIAL, COMPRISING A PHOTOCONDUCTOR SELECTIVE TO A GIVEN CHARGE POLARITY, ON A BASE COMPRISING AN ELECTRICAL INSULATOR; ESTABLISHING SAID LAYER OF PHOTOCONDUCTOR MATERIAL IN ELECTRICAL CONTACT, AT ONE SURFACE THEREOF, WITH AN ELECTRICALLY CONDUCTIVE BACKING; DISPOSING THE PHOTOCONDUCTOR LAYER IN SPACED RELATION TO A CORONA DISCHARGE MEANS WITH THE DISCHARGE MEANS FACING THE SURFACE OF THE PHOTOCONDUCTOR LAYER OPPOSITE THE CONDUCTIVE BACKING; AND APPLYING A BALANCED HIGH-VOLTAGE ALTERNATING CURRENT BETWEEN THE DISCHARGE MEANS AND THE CONDUCTIVE BACKING TO AFFORD A BALANCED A.C. CORONA DISCHARGE THEREBETWEEN AND CHARGE THE PHOTOCONDUCTOR LAYER TO SAID GIVEN CHARGE POLARITY, CHARGES OF OPPOSITE POLARITY BEING DISCHARGED THROUGH SAID CONDUCTIVE BACKING.
Claim 2
Dependent Claim
143 words
IN A XEROGRAPHIC PROCESS IN WHICH A LAYER OF PHOTOCONDUCTOR MATERIAL IS CHARGED IN THE ABSENCE OF ILLUMINATION AND SUBSEQUENTLY EXPOSED TO PRODUCE A CHARGE PATTERN ON THE PHOTOCONDUCTOR, THE CHARGING METHOD COMPRISING: APPLYING A LAYER OF PHOTOCONDUCTOR MATERIAL, COMPRISING A PHOTOCONDUCTOR SELECTIVE TO A GIVEN CHARGE POLARITY, ON A BASE COMPRISING AN ELECTRICAL INSULATOR; ESTABLISHING SAID LAYER OF PHOTOCONDUCTOR MATERIAL IN ELECTRICAL CONTACT, AT ONE SURFACE THEREOF, WITH AN ELECTRICALLY CONDUCTIVE BACKING; DISPOSING THE PHOTOCONDUCTOR LAYER IN SPACED RELATION TO A CORONA DISCHARGE MEANS WITH THE DISCHARGE MEANS FACING THE SURFACE OF THE PHOTOCONDUCTOR LAYER OPPOSITE THE CONDUCTIVE BACKING; AND APPLYING A BALANCED HIGH-VOLTAGE ALTERNATING CURRENT BETWEEN THE DISCHARGE MEANS AND THE CONDUCTIVE BACKING TO AFFORD A BALANCED A.C. CORONA DISCHARGE THEREBETWEEN AND CHARGE THE PHOTOCONDUCTOR LAYER TO SAID GIVEN CHARGE POLARITY, CHARGES OF OPPOSITE POLARITY BEING DISCHARGED THROUGH SAID CONDUCTIVE BACKING.
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |