US3764207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic process utilizing single charging means for effecting simultaneous functions of charging and facilitating toner image transfer
Assignee: Fujifilm Holdings Corp
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Filing: 1971-12-10
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Granted: 1973-10-09
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Expires: 1991-12-10
Abstract
Abstract The electrophotographic duplication process comprising: A. CHARGING THE SURFACE OF AN ELECTROPHOTOGRAPHIC PHOTORECEPTOR; B. EXPOSURE SAID CHARGED SURFACE TO FORM AN ELECTROSTATIC ALLY CHARGED LATENT IMAGE THEREON; C. DEVELOP SAID LATENT IMAGE WITH A TONER HAVING A CHARGE OPPOSITE TO THAT OF SAID LATENT IMAGE; D. CHARGING SAID DEVELOPED LATENT IMAGE AND SAID PHOTORECEPTOR WITH A CHARGE OF THE SAME POLARITY AS IN STEP (A), THEREBY REVERSING THE POLARITY OF SAID TONER AND RECHARGING SAID PHOTORECEPTOR SURFACE; E. TRANSFERING THE MAJORITY OF SAID TONER TO A RECEIVING LAYER TO FORM A TONER IMAGE; F. REMOVING RESIDUAL TONER; G. REPEATING (B) - (F). Apparatus to accomplish the above purpore requiring only one corotron.
Inventors
- 👤 K Obuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:52
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/169; G03G13/00; G03G13/14; G03G13/16; G03G13/22; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
In electrophotographic duplicating apparatus comprising a photoreceptor surface, charging means to charge said surface, exposing means to expose said charged surface, developing means to develop said charged surface and provide a toner image and toner image transfer means for transferring said toner image to a receiving material, the improvement wherein said toner transfer means is disposed immediately after said charging means, said charging means effecting the simultaneous functions of charging said photoreceptor and reversing the polarity of said toner image frOm an initial value, which initial value is opposite to the charge imparted by the charging means.
Claim 2
Dependent Claim
97 words
In electrophotographic duplicating apparatus comprising a photoreceptor surface, charging means to charge said surface, exposing means to expose said charged surface, developing means to develop said charged surface and provide a toner image and toner image transfer means for transferring said toner image to a receiving material, the improvement wherein said toner transfer means is disposed immediately after said charging means, said charging means effecting the simultaneous functions of charging said photoreceptor and reversing the polarity of said toner image frOm an initial value, which initial value is opposite to the charge imparted by the charging means.
Claim 3
Dependent Claim
14 words
The improvement as in claim 1 where there is only one said charging means.
Claim 4
Dependent Claim
108 words
Electrophotographic duplication apparatus comprising: means for charging the surface of an electrophotographic photoreceptor; means for exposing the charged surface to form an electrostatically charged latent image thereon; means for developing said latent image with a toner having a charge opposite to that of said latent image; means for transferring the majority of said toner to a receiving layer to form a toner image; and means for removing residual toner from said photoreceptor; only said charging means being disposed between said developing means and said image transferring means so that prior to image transfer, the polarity of said toner is reversed and the surface of the photoreceptor is charged.
Claim 5
Dependent Claim
108 words
Electrophotographic duplication apparatus comprising: means for charging the surface of an electrophotographic photoreceptor; means for exposing the charged surface to form an electrostatically charged latent image thereon; means for developing said latent image with a toner having a charge opposite to that of said latent image; means for transferring the majority of said toner to a receiving layer to form a toner image; and means for removing residual toner from said photoreceptor; only said charging means being disposed between said developing means and said image transferring means so that prior to image transfer, the polarity of said toner is reversed and the surface of the photoreceptor is charged.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |