Patent US1331426A successfully refreshed from Google Patents.
US3869205A
Expired / Lapsed
US
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Illumination source for xerographic exposure
Assignee: Xerox Corp
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Filing: 1973-08-29
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Granted: 1975-03-04
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Expires: 1993-08-29
Abstract
Abstract A zerographic system and process in which illumination is by means of a light source emitting yellow light, preferably the narrow emission bands of the low pressure sodium vapor lamp.
Inventors
- 👤 Charles F Gallo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/04036
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A xerographic system including an object surface, projection lens, an image surface in conjugate relationship to said object surface, and illumination means to irradiate objects disposed on said object surface for optimum object contrast, said illumination means being a narrow emission band light source emitting light in the yellow portion of the visible spectrum as the result of a sodium vapor discharge, and a yellow-sensitive photoreceptor at said image surface.
Claim 2
Dependent Claim
70 words
A xerographic system including an object surface, projection lens, an image surface in conjugate relationship to said object surface, and illumination means to irradiate objects disposed on said object surface for optimum object contrast, said illumination means being a narrow emission band light source emitting light in the yellow portion of the visible spectrum as the result of a sodium vapor discharge, and a yellow-sensitive photoreceptor at said image surface.
Claim 3
Dependent Claim
68 words
A xerographic system including an object surface, a projection lens, a yellow-sensitive photoreceptor surface in conjugate relationship to said object surface, and illumination means to irradiate varicolored objects at said object surface to obtain light-dark object contrast without color fidelity, said illumination means being a narrow emission band light source emitting light in the yellow portion of the visible spectrum as the result of a sodium vapor discharge.
Claim 4
Dependent Claim
68 words
A xerographic system including an object surface, a projection lens, a yellow-sensitive photoreceptor surface in conjugate relationship to said object surface, and illumination means to irradiate varicolored objects at said object surface to obtain light-dark object contrast without color fidelity, said illumination means being a narrow emission band light source emitting light in the yellow portion of the visible spectrum as the result of a sodium vapor discharge.
Claim 5
Dependent Claim
20 words
A xerographic system as defined in claim 2 in which said photoreceptor surface includes a photoconductive material of arsenic triselenide.
References Cited (Backward Citations)
US3594160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |