Patent US4197331A successfully refreshed from Google Patents.
US4197331A
Expired / Lapsed
US
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Novel electrostatic imaging system
Assignee: Xerox Corp
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Filing: 1978-12-14
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Granted: 1980-04-08
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Expires: 1998-12-14
Abstract
Abstract An electrostatic imaging system in which a conductive pattern and triboelectric charging are utilized on opposite sides of an electrically insulating member to form a developable electrostatic latent image. Electrostatically charged marking particles are deposited in conformance to the latent image and thereafter transferred to a receiving sheet. Charging, development and transfer are effected without the aid of light or any externally applied voltage.
Inventors
- 👤 Robert W. Gundlach
- 👤 Richard F. Bergen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:40
CPC Classifications
G; G03; G03G; G03G13/00; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
104 words
An electrostatic imaging process comprising providing an imaging member having an imaging surface on one side and a non-imaging surface on the opposite side, contacting said non-imaging surface with an electrically grounded conductive pattern, triboelectrically charging said imaging surface to a first polarity to induce an electrostatic charge having a polarity opposite said first polarity in said conductive pattern at the interface of said conductive pattern with said non-imaging surface, and contacting said imaging surface with toner particles having an electrostatic charge of the same polarity as said first polarity to deposit on said imaging surface a deposited toner image conforming to said pattern.
Claim 2
Dependent Claim
104 words
An electrostatic imaging process comprising providing an imaging member having an imaging surface on one side and a non-imaging surface on the opposite side, contacting said non-imaging surface with an electrically grounded conductive pattern, triboelectrically charging said imaging surface to a first polarity to induce an electrostatic charge having a polarity opposite said first polarity in said conductive pattern at the interface of said conductive pattern with said non-imaging surface, and contacting said imaging surface with toner particles having an electrostatic charge of the same polarity as said first polarity to deposit on said imaging surface a deposited toner image conforming to said pattern.
Claim 3
Dependent Claim
48 words
An electrostatic imaging process according to claim 1 including the step of placing an electrically grounded conductive or semiconductive receiving member in contact with said deposited toner image and separating said receiving member from said imaging surface whereby said deposited toner image is transferred to said receiving member.
Claim 4
Dependent Claim
21 words
An electrostatic imaging process according to claim 2 wherein said receiving member has a resistivity less than about 10 8 ohm-cm.
Claim 5
Dependent Claim
24 words
An electrostatic imaging process according to claim 1 including simultaneously triboelectrically charging said imaging surface and contacting said imaging surface with said toner particles.
Claim 6
Dependent Claim
22 words
An electrostatic imaging process according to claim 1 wherein said imaging member has a resistivity of at least about 10 13 ohm-cm.
Claim 7
Dependent Claim
22 words
An electrostatic imaging process according to claim 1 wherein said imaging member has a resistivity of at least about 10 14 ohm-cm.
Claim 8
Dependent Claim
20 words
An electrostatic imaging process according to claim 1 wherein said imaging member has a thickness less than about 8 mils.
Claim 9
Dependent Claim
23 words
An electrostatic imaging process according to claim 1 wherein said imaging member has a thickness from about 1.5 mils to about 3 mils.
Claim 10
Dependent Claim
22 words
An electrostatic imaging process according to claim 1 wherein said condutive pattern has a surface resistivity less than about 10 7 ohms/square.
Claim 11
Dependent Claim
22 words
An electrostatic imaging process according to claim 1 wherein said conductive pattern has a surface resistivity less than about 10 5 ohms/square.
Claim 12
Dependent Claim
25 words
An electrostatic imaging process according to claim 1 including providing a conductive pattern comprising separate multiple electrode elements and providing electrical connections between said elements.
Claim 13
Dependent Claim
26 words
An electrostatic imaging process according to claim 11 including maintaining said electrical connections from said non-imaging surface by a distance of at least about 20 mils.
Claim 14
Dependent Claim
26 words
An electrostatic imaging process according to claim 11 including maintaining said electrical connections from said non-imaging surface by a distance of at least about 30 mils.
Claim 15
Dependent Claim
25 words
An electrostatic imaging process according to claim 11 wherein said electrical connections have a width less than about one-fifth the thickness of the imaging member.
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) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |