Patent US4695152A successfully refreshed from Google Patents.
US4695152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charge erase device for an electrophotographic printing machine
Assignee: Xerox Corp
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Filing: 1985-11-18
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Granted: 1987-09-22
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Expires: 2005-11-18
Abstract
Abstract Neon lamps are disclosed which are used to modify previously formed charge levels on the surface of a photoconductive member. The lamps have cold cathode electrodes sealed into its opposite ends and are filled with neon at a pressure range of from 18 to 25 torr.
Inventors
- 👤 Charles J. Urso, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:17
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/06; G03G21/08; G03G15/00; G03G15/04; G03G15/045; G03G15/047; G03G15/14; G03G15/16; G03G15/169; H; H01; H01J; H01J61/00; H01J61/70; H01J61/76; G03G2215/00; G03G2215/04; G03G2215/0429; G03G2215/0431; G03G2215/0448; G03G2215/0468; G03G2215/048; G03G2215/0482; G03G2215/0485
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
An electrophotographic printing machine comprising: a photoconductive member; means for forming a charge on the surface of said member, means for exposing said surface so as to form a latent electrostatic image on said surface and means for reducing the charge in at least one region of said surface, said charge reduction means including at least one lamp, said lamp comprising an elongated tubular glass envelope having cold cathode electrodes sealed into its opposite ends and containing neon at a pressure range of 18-25 torr, said lamp operating over a current range of 5 to 50 ma(rms); wherein said lamp operates at a current of approximately 35 ma (rms) and at a pressure range of approximately 21 torr.
Claim 2
Dependent Claim
118 words
An electrophotographic printing machine comprising: a photoconductive member; means for forming a charge on the surface of said member, means for exposing said surface so as to form a latent electrostatic image on said surface and means for reducing the charge in at least one region of said surface, said charge reduction means including at least one lamp, said lamp comprising an elongated tubular glass envelope having cold cathode electrodes sealed into its opposite ends and containing neon at a pressure range of 18-25 torr, said lamp operating over a current range of 5 to 50 ma(rms); wherein said lamp operates at a current of approximately 35 ma (rms) and at a pressure range of approximately 21 torr.
Claim 3
Dependent Claim
62 words
A neon lamp for modifying a charge level at the surface of a photoconductive member, said lamp comprising an elongated tubular glass envelope having cold cathode electrodes sealed into its opposite ends and containing neon at a pressure range of 18-25 torr; wherein said lamp operates at a current of approximately 35 ma and at a pressure range of approximately 21 torr.
Claim 4
Dependent Claim
62 words
A neon lamp for modifying a charge level at the surface of a photoconductive member, said lamp comprising an elongated tubular glass envelope having cold cathode electrodes sealed into its opposite ends and containing neon at a pressure range of 18-25 torr; wherein said lamp operates at a current of approximately 35 ma and at a pressure range of approximately 21 torr.
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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) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |