US3740158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow cell
Assignee: Bayer Corp
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Filing: 1971-12-17
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Granted: 1973-06-19
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Expires: 1991-12-17
Abstract
Abstract A flow cell having a nonmetallic elongated open-ended tubular body providing a longitudinal sight passageway in a portion of the light path between a light source and a light detector for colorimetric or densitometric analysis of a liquid sample within the passageway, the body having fluid inlet and outlet ports, one through the side-wall structure of the body adjacent each end of the latter. Light-transmitting fluid seals are provided closing the respective ends of the body, at least one of which seals has an interface with the liquid sample in the sight passageway and is structured of a material having a higher refractive index than the tubular body, so as to provide a light pipe for increasing the transmission of light through the flow cell sight passageway to the light detector.
Inventors
- 👤 S Bellinger
- 👤 J Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:23
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N21/05; G01N2021/0346
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A flow cell for location intermediate a light source and a photosensitive device for light measurement of a fluid therein in a light path, comprising: a body member defining an open-ended bore therethrough constituting a sight passageway to lie along a portion of the length of said light path, and a pair of fluid seals in the respective open ends of said bore and closing them, each of said seals being constituted by a single solid lighttransmitting rod extending into the corresponding end of said bore, portions of said body member in sealing contact with respective ones of said rods having a lower refractive index than said rods and being optically transparent, so that said rods constitute light pipes, said member having a fluid inlet port and a fluid outlet port, said ports opening into said bore adjacent respective ones of said seals for fluid flow through said sight passageway, said member and said seals being formed of chemically resistive material.
Claim 2
Dependent Claim
161 words
A flow cell for location intermediate a light source and a photosensitive device for light measurement of a fluid therein in a light path, comprising: a body member defining an open-ended bore therethrough constituting a sight passageway to lie along a portion of the length of said light path, and a pair of fluid seals in the respective open ends of said bore and closing them, each of said seals being constituted by a single solid lighttransmitting rod extending into the corresponding end of said bore, portions of said body member in sealing contact with respective ones of said rods having a lower refractive index than said rods and being optically transparent, so that said rods constitute light pipes, said member having a fluid inlet port and a fluid outlet port, said ports opening into said bore adjacent respective ones of said seals for fluid flow through said sight passageway, said member and said seals being formed of chemically resistive material.
Claim 3
Dependent Claim
17 words
A flow cell as defined in claim 1, wherein: said material of said body member is glass.
Claim 4
Dependent Claim
16 words
A flow cell as defined in claim 1, wherein: said material of said seals is sapphire.
Claim 5
Dependent Claim
16 words
A Flow cell as defined in claim 1, wherein: said seals project from said body member.
Claim 6
Dependent Claim
25 words
A flow cell as defined in claim 1, wherein: said material of said body member is glass, and said material of said seals is sapphire.
Claim 7
Dependent Claim
23 words
A flow cell as defined in claim 1, wherein: said body member and said seals have coefficients of expansion closely approximating one another.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |