US4160902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical reading head
Assignee: DE STAAT DER NEDERLANDEN TE DEZEN VERTEGENWOORDIGD DOOR DE DIRECTEUR-GENERAAL DER POSTERIJEN TELEGRAFIE EN TELEFONIE
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Filing: 1977-12-14
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Granted: 1979-07-10
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Expires: 1997-12-14
Abstract
Abstract Optical reading head, particularly for reading luminescent code bars on documents and the like, which reading head is provided with a source of light for irradiating the bars, with a detector including a hollow optical guide means for collecting the rays emitted by the bars, said guide means being made of a filter material transmitting ultraviolet radiation at least at the end of said guide near the point where the rays are collected.
Inventors
- 👤 Hans van Wijngaarden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:48
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10841; B; B07; B07C; B07C3/00; B07C3/10; B07C3/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
Optical reading head, particularly for reading luminescent code bars on documents and the like, which reading head comprises: a source of light for irradiating the bars, a detector for collecting the rays emitted by the bars, a filter material transmitting ultraviolet radiation at least adjacent the documents, and a hollow tubular optical guide for the filtered rays to said detector.
Claim 2
Dependent Claim
60 words
Optical reading head, particularly for reading luminescent code bars on documents and the like, which reading head comprises: a source of light for irradiating the bars, a detector for collecting the rays emitted by the bars, a filter material transmitting ultraviolet radiation at least adjacent the documents, and a hollow tubular optical guide for the filtered rays to said detector.
Claim 3
Dependent Claim
34 words
Optical reading head according to claim 1, wherein the source of radiation comprises a U-shaped low-pressure mercury vapour lamp, and said optical guide comprises a flat tube placed between the legs of said lamp.
Claim 4
Dependent Claim
26 words
Optical reading head according to claim 1 wherein said head includes a second optical filter adjacent said detector for transmitting the radiation transmitted through said guide.
References Cited (Backward Citations)
US3662181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |