US4855818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Document reading apparatus with color filter
Assignee: Sharp Corp
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Filing: 1988-07-27
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Granted: 1989-08-08
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Expires: 2008-07-27
Abstract
Abstract A documenting reading apparatus is comprised of a cylindrically shaped color filter with three filter elements having different colors. Both a light source and a cylindrical lens are disposed inside this cylindrical filter.
Inventors
- 👤 Kenichi Morimoto
- 👤 Takao Tagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:27
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/028; H04N1/02815; H04N1/02845; H04N1/0287; H04N1/02875; H04N1/46; H04N1/48; H04N1/482; H04N1/484
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
In a document reading apparatus for reading color information of a document by using a color filter to color-decompose scanning light, a color filter formed in a cylindrical shape with a plurality of filter elements having different colors, a light source disposed inside said cylindrical color filter and a cylindrical lens disposed inside said cylindrical color filter.
Claim 2
Dependent Claim
57 words
In a document reading apparatus for reading color information of a document by using a color filter to color-decompose scanning light, a color filter formed in a cylindrical shape with a plurality of filter elements having different colors, a light source disposed inside said cylindrical color filter and a cylindrical lens disposed inside said cylindrical color filter.
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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |