Patent US3712728A successfully refreshed from Google Patents.
US3712728A
Expired / Lapsed
US
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Reversal development
Assignee: Xerox Corp
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Filing: 1971-01-06
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Granted: 1973-01-23
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Expires: 1991-01-06
Abstract
Abstract Reversal prints are obtained in an electrostatographic imaging system employing polar liquid development wherein after development the electrostatographic imaging surface is discharged in the charged undeveloped areas to reduce lateral spreading of the polar liquid developer from the developed uncharged areas into the charged background areas of the imaging surface.
Inventors
- 👤 G Whittaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/101; G03G15/102; G03G13/00; G03G13/22; G03G9/00; G03G9/08; G03G9/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
15 words
The imaging system of claim 1 wherein said discharge means comprises a corona discharge device.
Claim 2
Dependent Claim
22 words
The imaging system of claim 1 further including means to transfer the liquid developer from the imaging surface to a receiving surface.
Claim 3
Dependent Claim
39 words
The imaging system of claim 1 wherein said electrostatographic imaging surface comprises a photoconductive insulating layer and said discharge means comprises means to expose said photoconductive insulating layer to radiation of a wavelength which renders the photoconductive layer conductive.
References Cited (Backward Citations)
US3084043A
Cited
US3383209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |