US3038799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reversing the image in xerography
Assignee: Australian Government
•
Filing: 1958-12-30
•
Granted: 1962-06-12
•
Expires: 1978-12-30
Abstract
No abstract record available.
Inventors
- 👤 Metcalfe Kenneth Archibald
- 👤 Wright Robert John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:22
CPC Classifications
G; G04; G04B; G04B39/00; G04B39/004; B; B29; B29C; B29C67/00; G03; G03G; G03G13/00; G03G13/06; G03G13/22; G03G9/00; G03G9/08; G03G9/12; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
THE METHOD OF REVERSING THE IMAGE IN XEROGRAPHY COMPRISING THE STEPS OF PLACING A FIRST CHARGE ON A PHOTOCONDUCTOR SURFACE IN THE ABSENCE OF LIGHT, EXPOSING THE SAID PHOTOCONDUCTOR SURFACE TO A LIGHT IMAGE TO PRODUCE A SELECTIVE ELECTROSTATIC PATTERN WHEREIN THE MAGNITUDE OF THE LATENT ELECTROSTATIC IMAGE IS PROPORTIONAL TO THE IMAGE DENSITY, DEVELOPING THE SAID ELECTROSTATIC PATTERN IN THE ABSENCE OF LIGHT WITH A DEVELOPER COMPRISING A SUBSTANCE WHICH HAS A VOLUME RESISTIVITY OF LESS THAN 1010 OHM CENTIMETRE AND WHICH IS SUSPENDED IN AN ELECTRICALLY INSULATING CARRIER LIQUID HAVING A VOLUME RESISTIVITY OF MORE THAN 1010 OHM CENTIMETRE WHEREBY DEPOSITION TAKES PLACE FROM THE SAID CARRIER LIQUID OF A MODIFYING LAYER IN THICKNESS DEPENDING ON THE MAGNITUDE OF THE SAID LATENT IMAGE WHICH THEREBY PROPORTIONALLY SHIELDS THE PHOTOCONDUCTOR AGAINST RECHARGING, MAINTAINING THE SAID MODIFYING LAYER IN PLACE WHILE RECHARGING THE SAID PHOTOCONDUCTOR SURFACE IN THE ABSENCE OF LIGHT WHEREBY THE RECHARGING PRODUCES AN ELECTROSTATIC LATENT IMAGE OPPOSITE TO THAT FIRST PRODUCED AND DEVELOPING THE SECOND SAID IMAGE IN THE ABSENCE OF LIGHT.
Claim 2
Independent Claim
175 words
THE METHOD OF REVERSING THE IMAGE IN XEROGRAPHY COMPRISING THE STEPS OF PLACING A FIRST CHARGE ON A PHOTOCONDUCTOR SURFACE IN THE ABSENCE OF LIGHT, EXPOSING THE SAID PHOTOCONDUCTOR SURFACE TO A LIGHT IMAGE TO PRODUCE A SELECTIVE ELECTROSTATIC PATTERN WHEREIN THE MAGNITUDE OF THE LATENT ELECTROSTATIC IMAGE IS PROPORTIONAL TO THE IMAGE DENSITY, DEVELOPING THE SAID ELECTROSTATIC PATTERN IN THE ABSENCE OF LIGHT WITH A DEVELOPER COMPRISING A SUBSTANCE WHICH HAS A VOLUME RESISTIVITY OF LESS THAN 1010 OHM CENTIMETRE AND WHICH IS SUSPENDED IN AN ELECTRICALLY INSULATING CARRIER LIQUID HAVING A VOLUME RESISTIVITY OF MORE THAN 1010 OHM CENTIMETRE WHEREBY DEPOSITION TAKES PLACE FROM THE SAID CARRIER LIQUID OF A MODIFYING LAYER IN THICKNESS DEPENDING ON THE MAGNITUDE OF THE SAID LATENT IMAGE WHICH THEREBY PROPORTIONALLY SHIELDS THE PHOTOCONDUCTOR AGAINST RECHARGING, MAINTAINING THE SAID MODIFYING LAYER IN PLACE WHILE RECHARGING THE SAID PHOTOCONDUCTOR SURFACE IN THE ABSENCE OF LIGHT WHEREBY THE RECHARGING PRODUCES AN ELECTROSTATIC LATENT IMAGE OPPOSITE TO THAT FIRST PRODUCED AND DEVELOPING THE SECOND SAID IMAGE IN THE ABSENCE OF LIGHT.
References Cited (Backward Citations)
US992898A
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US2647464A
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US2758525A
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US2868642A
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US2817598A
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US2914403A
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US2907674A
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US2817765A
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US2939787A
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US2940847A
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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) | 1965-06-11 | 1965-12-11 | 1966-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-11 | 1969-12-11 | 1970-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-11 | 1973-12-11 | 1974-06-12 | $7700.00 | Window Closed / Lapsed |