US3926518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical scanning system
Assignee: Xerox Corp
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Filing: 1974-05-21
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Granted: 1975-12-16
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Expires: 1994-05-21
Abstract
Abstract An optical scanning system for scanning a document to be copied providing an optical path and including a document illuminating means, light intensity detector means having a line of sight at least adjacent said optical path, and control means arranged to respond to signals from said light intensity detector means to adjust the intensity of illumination passing along said optical path.
Inventors
- 👤 Peter J Berry
- 👤 Gerald J Maguire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:39
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526; G03G; G03G15/00; G03G15/04; G03G15/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
An optical scanning system for scanning a document to be copied providing an optical path and including document illuminating means, light intensity detector means having a line of sight adjacent to said optical path, and control means arranged to respond to signals from said light intensity detector means to adjust the intensity of illumination passing along said optical path, a xerographic photoreceptor having an electrical bias voltage impressed thereon, and means to vary said bias voltage on said photoreceptor in response to said control means.
Claim 2
Dependent Claim
85 words
An optical scanning system for scanning a document to be copied providing an optical path and including document illuminating means, light intensity detector means having a line of sight adjacent to said optical path, and control means arranged to respond to signals from said light intensity detector means to adjust the intensity of illumination passing along said optical path, a xerographic photoreceptor having an electrical bias voltage impressed thereon, and means to vary said bias voltage on said photoreceptor in response to said control means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |