Patent US3281240A successfully refreshed from Google Patents.
US3281240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic material
Assignee: Gevaert Photo Producten NV
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Filing: 1961-10-12
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Granted: 1966-10-25
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Expires: 1981-10-12
Abstract
No abstract record available.
Inventors
- 👤 Cassiers Paul Maria
- 👤 Noe Robert Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:04
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/075; G03G5/071; G03G5/072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
IN A METHOD OF REPRODUCING AN ORIGINAL BY THE CREATION OF A PATTERN OF ELECTROSTATICALLY CHARGED AND UNCHARGED AREAS ACCORDING TO SAID ORIGINAL ON A SUPPORTED NORMALLY INSULATING LAYER BECOMING CONDUCTIVE UPON EXPOSURE TO ELECTROMAGNETIC RADIATION, WHICH METHOD INCLUDES THE STEPS OF ELECTROSTATICALLY CHARGING SAID LAYER AND EXPOSING SAID LAYER TO AN IMAGE OF SAID RADIATION ACCORDING TO SAID ORIGINAL TO CREATE SAID PATTERN AND DEVELOPING SAID CHARGED AREAS OF SAID PATTERN WITH FINELY-DIVIDED ELECTROSTATICALLY ATTRACTABLE MATERIAL ATTRACTED BY THE CHARGES THEREIN BUT NOT ATTRACTED TO THE UNCHARGED AREAS THEREOF, THE IMPROVEMENT WHEREIN SAID SUPPORTED LAYER IS COMPRISED ESSENTIALLY OF AN INSULATING ORGANIC POLYMER BECOMING CONDUCTIVE UPON SAID EXPOSURE AND HAVING AT LEAST SUBSTANTIALLY UNIFORMLY DISTRIBUTED THERETHROUGH DISCRETE FINELY DIVIDED PARTICLES OF A POLYMERIC SUBSTANCE LESS CONDUCTIVE UPON EXPOSURE TO SAID RADIATION THAN SAID INSULATING ORGANIC POLYMER, THE ARITHMETIC PRODUCT OF THE DIELECTRIC CONSTAND AND THE SPECIFIC ELECTRIC RESISTANCE OF SAID INSULATING ORGANIC POLYMER MEASURED IN THE DARK DIFFERING BY A FACTOR OF AT LEAST TWO FROM THAT OF SAID POLYMERIC SUBSTANCE, SAID POLYMERIC SUBSTANCE BEING PRESENT IN SAID LAYER IN THE AMOUNT OF ABOUT 5-50% BY WEIGHT OF SAID INSULATING ORGANIC POLYMER.
Claim 2
Dependent Claim
193 words
IN A METHOD OF REPRODUCING AN ORIGINAL BY THE CREATION OF A PATTERN OF ELECTROSTATICALLY CHARGED AND UNCHARGED AREAS ACCORDING TO SAID ORIGINAL ON A SUPPORTED NORMALLY INSULATING LAYER BECOMING CONDUCTIVE UPON EXPOSURE TO ELECTROMAGNETIC RADIATION, WHICH METHOD INCLUDES THE STEPS OF ELECTROSTATICALLY CHARGING SAID LAYER AND EXPOSING SAID LAYER TO AN IMAGE OF SAID RADIATION ACCORDING TO SAID ORIGINAL TO CREATE SAID PATTERN AND DEVELOPING SAID CHARGED AREAS OF SAID PATTERN WITH FINELY-DIVIDED ELECTROSTATICALLY ATTRACTABLE MATERIAL ATTRACTED BY THE CHARGES THEREIN BUT NOT ATTRACTED TO THE UNCHARGED AREAS THEREOF, THE IMPROVEMENT WHEREIN SAID SUPPORTED LAYER IS COMPRISED ESSENTIALLY OF AN INSULATING ORGANIC POLYMER BECOMING CONDUCTIVE UPON SAID EXPOSURE AND HAVING AT LEAST SUBSTANTIALLY UNIFORMLY DISTRIBUTED THERETHROUGH DISCRETE FINELY DIVIDED PARTICLES OF A POLYMERIC SUBSTANCE LESS CONDUCTIVE UPON EXPOSURE TO SAID RADIATION THAN SAID INSULATING ORGANIC POLYMER, THE ARITHMETIC PRODUCT OF THE DIELECTRIC CONSTAND AND THE SPECIFIC ELECTRIC RESISTANCE OF SAID INSULATING ORGANIC POLYMER MEASURED IN THE DARK DIFFERING BY A FACTOR OF AT LEAST TWO FROM THAT OF SAID POLYMERIC SUBSTANCE, SAID POLYMERIC SUBSTANCE BEING PRESENT IN SAID LAYER IN THE AMOUNT OF ABOUT 5-50% BY WEIGHT OF SAID INSULATING ORGANIC POLYMER.
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |