US3881826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photometer chamber unit
Assignee: AUTO CHEM INSTRUMENT AB
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Filing: 1973-12-20
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Granted: 1975-05-06
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Expires: 1993-12-20
Abstract
Abstract A photometer chamber unit in which a liquid to be analyzed is sucked into a photometer chamber, comprises a channel system with a pipette tube which is to be inserted in a liquid and at least one photometer chamber which is to be passed by light. At the end of the channel system remote from the pipette tube the channel system ends with a damping capillary tube which opens into a chamber, whereas means are provided for achieving a first lower pressure difference between the pressure in the chamber and the pressure on the liquid around the pipette tube for sucking liquid into the channel system and for achieving a second higher pressure difference between the pressure in the chamber and the pressure on the liquid around the pipette tube for emptying the liquid from the channel system.
Inventors
- 👤 Leeuw Jan De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:11
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N21/05; G01N35/00; G01N35/10; G01N35/1095; G01N35/1097; G01N2035/1027; G01N2035/1048; G01N2035/1062
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
189 words
In a photometer chamber unit in which a liquid to be analyzed is sucked into a photometer chamber, said unit comprising a channel system with a pipette tube for insertion into a liquid, and at least one photometer chamber which is to be passed by light, the improvement wherein the channel system is one single unbranched channel from the pipette through the photometer chamber, and at the end of the unbranched channel system remote from the pipette tube the channel system ends with a vertical damping capillary tube which extends into and opens into a chamber and constitutes a continuation of said single unbranched channel, and means are provided for achieving a first lower pressure difference between the pressure in the chamber and the pressure on the liquid around the pipette tube for sucking liquid into the channel system only until it reaches the upper end of said capillary tube in said chamber, and for achieving a second higher pressure difference between the pressure in the chamber and the pressure on the liquid around the pipette tube for emptying the liquid from the channel system and into the chamber.
Claim 2
Dependent Claim
189 words
In a photometer chamber unit in which a liquid to be analyzed is sucked into a photometer chamber, said unit comprising a channel system with a pipette tube for insertion into a liquid, and at least one photometer chamber which is to be passed by light, the improvement wherein the channel system is one single unbranched channel from the pipette through the photometer chamber, and at the end of the unbranched channel system remote from the pipette tube the channel system ends with a vertical damping capillary tube which extends into and opens into a chamber and constitutes a continuation of said single unbranched channel, and means are provided for achieving a first lower pressure difference between the pressure in the chamber and the pressure on the liquid around the pipette tube for sucking liquid into the channel system only until it reaches the upper end of said capillary tube in said chamber, and for achieving a second higher pressure difference between the pressure in the chamber and the pressure on the liquid around the pipette tube for emptying the liquid from the channel system and into the chamber.
Claim 3
Dependent Claim
20 words
Arrangement as claimed in claim 1 in which the chamber is connected with means for removing liquid from the chamber.
Claim 4
Dependent Claim
34 words
Arrangement as claimed in claim 1 in which the capillary tube is inserted into a hole in the wall of the chamber which is self-sealing upon removing of the capillary tube from the hole.
Claim 5
Dependent Claim
18 words
Arrangement as claimed in claim 1 and further comprising means for supplying a foam-quenching liquid to the chamber.
Claim 6
Dependent Claim
33 words
Arrangement as claimed in claim 4 wherein an inverted funnel is located above the free end of the capillary tube and wherein means are provided for damping said funnel with the foam-quenching liquid.
Claim 7
Dependent Claim
62 words
Arrangement as claimed in claim 1 wherein the photometer chamber in the channel system between the pipette tube and the capillary tube consists of a diametrical hole in a circular body, and each end of the hole is connected with an axial recess in the mantle surface of the body and the body is sealingly surrounded by a tube of transparent material.
Claim 8
Dependent Claim
51 words
Arrangement as claimed in claim 6 wherein optical fibre bundles are located coaxial with the diametrical hole for the conduit of light to and from the photometer chamber, and a collecting lens is inserted between the optical fibre bundle for the supply of light and the wall of the transparent tube.
Claim 9
Dependent Claim
20 words
Arrangement as claimed in claim 6 wherein the transparent tube is turnable and axially displaceable in relation to the body.
Claim 10
Dependent Claim
44 words
Arrangement as claimed in claim 6 wherein a light guiding rod is inserted in the body in the same plane as the photometer chamber and perpendicular to said chamber, and an optical fibre bundle is located outside the transparent tube coaxial with said rod.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |