US4952126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for determination of microconstituents
Assignee: YOKOLAWA HOKUSHIN ELECTRIC Corp A CORP OF JAPAN
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Filing: 1985-04-10
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Granted: 1990-08-28
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Expires: 2005-04-10
Abstract
Abstract A method and apparatus for determining, by use of ion chromatography, a microconstituent contained in a major constituent as impurities present in the major constituent. The invention causes only that portion of the effluent from the detector, shown on an ion chromatograph, that corresponds to the neighborhood of the microconstituent to be led again to the collecting valve. Thus, the microconstituent of the solution can be determined quickly and easily, without reference to the kind of microconstituent being tested.
Inventors
- 👤 Yuzuru Hanaoka
- 👤 Takeshi Murayama
- 👤 Tamizo Matsuura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:45
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/96; G01N30/02; G01N30/26; G01N30/38; G01N30/44; G01N2030/965; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25125; Y10T436/25375; Y10T436/255
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
209 words
An apparatus for determining a microconstituent in a solution containing such a microconstituent in combination with a major constituent, said apparatus comprising, in combination, a first sample valve for collecting a prescribed amount of a solution being tested; a first separation column comprising a first filler and having a first separation mode for separating microconstituents from a solution being tested conveyed from said first sample valve; a suppressor for depriving effluent conveyed from said first separation column of background of physical quantity; a first detector for detecting a physical quantity of effluent conveyed from said suppressor; a switch valve for fractionating only a portion of effluent conveyed from said first detector which corresponds to a neighborhood of a microconstituent; a second sample valve interconnected directly and solely to said switch valve and a second separation column for collecting a prescribed amount of fractionated solution conveyed from said switch valve; said second separation column for separating a microconstituent from fractionated solution conveyed from said second sample valve, said second separation column comprising a second filler and having a second mode of separation different from said first separation mode of said first separation column; and a second detector for detecting a physical quantity of effluent conveyed from said second separation column.
Claim 2
Independent Claim
209 words
An apparatus for determining a microconstituent in a solution containing such a microconstituent in combination with a major constituent, said apparatus comprising, in combination, a first sample valve for collecting a prescribed amount of a solution being tested; a first separation column comprising a first filler and having a first separation mode for separating microconstituents from a solution being tested conveyed from said first sample valve; a suppressor for depriving effluent conveyed from said first separation column of background of physical quantity; a first detector for detecting a physical quantity of effluent conveyed from said suppressor; a switch valve for fractionating only a portion of effluent conveyed from said first detector which corresponds to a neighborhood of a microconstituent; a second sample valve interconnected directly and solely to said switch valve and a second separation column for collecting a prescribed amount of fractionated solution conveyed from said switch valve; said second separation column for separating a microconstituent from fractionated solution conveyed from said second sample valve, said second separation column comprising a second filler and having a second mode of separation different from said first separation mode of said first separation column; and a second detector for detecting a physical quantity of effluent conveyed from said second separation column.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1, wherein said first detector is a detector for electric conductivity.
Claim 4
Independent Claim
156 words
An apparatus for determining a microconstituent in a solution containing such a microconstituent in combination with a major constituent, said apparatus comprising, in combination, a first sample valve for collecting a prescribed amount of a solution being tested; a separation column for separating microconstituents from a solution being tested conveyed from said first sample valve and from a fractionated solution conveyed from a second sample valve; a suppressor for depriving effluent conveyed from said separation column of background of physical quantity; a detector for detecting a physical quantity of effluent conveyed from said suppressor; a switch valve for fractionating only a portion of effluent conveyed from said detector which corresponds to a neighborhood of a microconstituent; and said second sample valve connected to said switch valve and said separation column for collecting a prescribed amount of fractionated solution conveyed from said switch valve and for introducing said prescribed amount of fractionated solution into said separation column.
Claim 5
Independent Claim
156 words
An apparatus for determining a microconstituent in a solution containing such a microconstituent in combination with a major constituent, said apparatus comprising, in combination, a first sample valve for collecting a prescribed amount of a solution being tested; a separation column for separating microconstituents from a solution being tested conveyed from said first sample valve and from a fractionated solution conveyed from a second sample valve; a suppressor for depriving effluent conveyed from said separation column of background of physical quantity; a detector for detecting a physical quantity of effluent conveyed from said suppressor; a switch valve for fractionating only a portion of effluent conveyed from said detector which corresponds to a neighborhood of a microconstituent; and said second sample valve connected to said switch valve and said separation column for collecting a prescribed amount of fractionated solution conveyed from said switch valve and for introducing said prescribed amount of fractionated solution into said separation column.
Claim 6
Dependent Claim
14 words
The apparatus of claim 3, wherein said detector comprises a detector for electric conductivity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |