US3814515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scattered toner shield device in electrophotographic copying machine
Assignee: Canon Inc
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Filing: 1972-08-17
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Granted: 1974-06-04
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Expires: 1992-08-17
Abstract
Abstract A scattered toner shield device in an electrophotographic copying machine which includes a photosensitive medium having a dielectric surface layer and a photoconductive layer, primary charger means, contemporaneous exposure and discharge means, a developing station comprising overall exposure means and developing means, and if required, a transfer station. The shield device comprises an insulative shield member disposed between the contemporaneous exposure and discharge means and the developing station and in contact with the photosensitive medium. The shield device may further comprise a second insulative shield member disposed between the developing station and the transfer station.
Inventors
- 👤 T Takahashi
- 👤 H Kadowaki
- 👤 T Kuge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:04
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0896; G03G15/0898
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
81 words
An electrophotographic copyinG machine comprising a photosensitive medium having an insulating surface layer and a photoconductive layer, charger means for uniformly charging said photosensitive medium, means for applying an original light image and a discharge contemporaneously, a developing station comprising blanket exposure means and developing means, and a shield device comprising a scattered toner shield member of insulative material disposed in contact with said photosensitive medium between said means for applying an original light image and discharge and said developing station.
Claim 2
Dependent Claim
81 words
An electrophotographic copyinG machine comprising a photosensitive medium having an insulating surface layer and a photoconductive layer, charger means for uniformly charging said photosensitive medium, means for applying an original light image and a discharge contemporaneously, a developing station comprising blanket exposure means and developing means, and a shield device comprising a scattered toner shield member of insulative material disposed in contact with said photosensitive medium between said means for applying an original light image and discharge and said developing station.
Claim 3
Dependent Claim
136 words
An electrophotographic copying machine including a photosensitive medium having an insulating surface layer and a photoconductive layer, charger means peripherally opposed to said photosensitive medium for applying a charge thereto, means for applying an original light image and a discharge contemporaneously, a developing station comprising blanket exposure means and dry type developing means, and a transfer station including means for transferring a developed image to a transfer medium, and a shield device comprising a first scattered developer shield member of insulative material disposed in contact with said photosensitive medium between said means for applying an original light image and discharge and said developing station, and a second scattered developer shield member disposed between said developing station and said transfer station to block any scattered toner and to guide a said transfer medium to said transfer station.
Claim 4
Dependent Claim
136 words
An electrophotographic copying machine including a photosensitive medium having an insulating surface layer and a photoconductive layer, charger means peripherally opposed to said photosensitive medium for applying a charge thereto, means for applying an original light image and a discharge contemporaneously, a developing station comprising blanket exposure means and dry type developing means, and a transfer station including means for transferring a developed image to a transfer medium, and a shield device comprising a first scattered developer shield member of insulative material disposed in contact with said photosensitive medium between said means for applying an original light image and discharge and said developing station, and a second scattered developer shield member disposed between said developing station and said transfer station to block any scattered toner and to guide a said transfer medium to said transfer station.
References Cited (Backward Citations)
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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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |