US4292386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductive drum with paper layer attachment
Assignee: Toshiba Corp
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Filing: 1979-12-17
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Granted: 1981-09-29
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Expires: 1999-12-17
Abstract
Abstract An electronic copying apparatus includes a photosensitive drum having a drum body and a photosensitive layer of (ZnO) formed on the outer periphery of the drum body. Said drum body has a hollow cylinder made of paper or synthetic resin, a conductive layer formed on the outer periphery of said hollow cylinder and a low resistance layer formed on the outer peripheral surface of the conductive layer, said photosensitive layer formed on the outer peripheral surface of said low resistance layer.
Inventors
- 👤 Toshimasa Takano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:20
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/75; G03G15/751; G03G5/00; G03G5/10; G03G5/101
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A photosensitive drum for a copying apparatus, comprising: a hollow cylinder including a plastic hollow cylinder base; a projection secured to the outer periphery of the cylinder base extending parallel to the axis of the cylinder base and having a cross-shaped section; and a rectangular paper sheet rolled about the outer periphery of the cylinder base, the edges of the paper sheet being attached to the projection; a conductive layer formed on the outer periphery of the hollow cylinder, the conductive layer being fabricated from a synthetic resin containing carbon powder that is partly impregnated into the outer periphery of the hollow cylinder; and a low resistance layer formed on the outer periphery of the conductive layer; and a photosensitive layer formed on the outer periphery of the low resistance layer.
Claim 2
Dependent Claim
131 words
A photosensitive drum for a copying apparatus, comprising: a hollow cylinder including a plastic hollow cylinder base; a projection secured to the outer periphery of the cylinder base extending parallel to the axis of the cylinder base and having a cross-shaped section; and a rectangular paper sheet rolled about the outer periphery of the cylinder base, the edges of the paper sheet being attached to the projection; a conductive layer formed on the outer periphery of the hollow cylinder, the conductive layer being fabricated from a synthetic resin containing carbon powder that is partly impregnated into the outer periphery of the hollow cylinder; and a low resistance layer formed on the outer periphery of the conductive layer; and a photosensitive layer formed on the outer periphery of the low resistance layer.
Claim 3
Dependent Claim
142 words
In an electronic copying apparatus, a photosensitive drum comprising: a drum body including a hollow cylinder made of at least one selected from the group consisting of paper and a synthetic resin, a conductive layer formed on the outer periphery of the hollow cylinder, and a low resistance layer formed on the outer peripheral surface of the conductive layer; and a photosensitive layer formed on the outer peripheral surface of the low resistance layer, wherein said hollow cylinder has a hollow cylinder base made of plastics, a projection secured to the outer periphery of the plastic hollow cylinder base, extending parallel to the axis of the plastic hollow cylinder base and having a cross-shaped section, and a rectangular paper sheet rolled about the outer periphery of the plastic hollow cylindrical base, the edges of said paper sheet being attached to the projection.
Claim 4
Dependent Claim
142 words
In an electronic copying apparatus, a photosensitive drum comprising: a drum body including a hollow cylinder made of at least one selected from the group consisting of paper and a synthetic resin, a conductive layer formed on the outer periphery of the hollow cylinder, and a low resistance layer formed on the outer peripheral surface of the conductive layer; and a photosensitive layer formed on the outer peripheral surface of the low resistance layer, wherein said hollow cylinder has a hollow cylinder base made of plastics, a projection secured to the outer periphery of the plastic hollow cylinder base, extending parallel to the axis of the plastic hollow cylinder base and having a cross-shaped section, and a rectangular paper sheet rolled about the outer periphery of the plastic hollow cylindrical base, the edges of said paper sheet being attached to the projection.
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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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |