US4556538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatographic apparatus
Assignee: TOYO SODA MANUFACTURING Co Ltd A CORP OF JAPAN
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Filing: 1982-03-24
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Granted: 1985-12-03
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Expires: 2002-03-24
Abstract
Abstract The present invention relates to a chromatographic apparatus for analyzing a sample of an aqueous solution containing a plurality of micro-concentration components. In the apparatus an aqueous solution sample and an eluting solution are introduced into a separating column having a length of 20 to 90 mm, which is filled with a predetermined separating carrier and placed in a thermostatic oven which also contains a detecting cell connected to the separating column, by means of a constant flow, pulse free feeding pump.
Inventors
- 👤 Susumu Matsushita
- 👤 Yoshimitsu Tada
- 👤 Tetsuo Ikushige
- 👤 Nobuyuki Baba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:19
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/88
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A chromatographic analytical apparatus comprising: 1. A column from 20 to 90 mm in length for separation of the components of an aqueous sample solution, said column containing a spherical porous barrier comprising an ion exchange gel having particle size of 1 to 8 μm, a pore size less than 1000 A, an ion exchange capacity of 0.03 to 1.0 milliequivalents/g and a mechanical strength greater than 200 kg/cm 2 , 2. a detecting cell having a cell capacity less than 1.9 μl for detecting eluates from the separating column, 3. a detector operatively connected to the detecting cell, and 4. a constant flow, pulse free feeding pump for feeding an eluting solution to the separating column, said column, detector and pump being operatively connected, said separating column and detecting cell arranged in a thermostatic oven.
Claim 2
Dependent Claim
136 words
A chromatographic analytical apparatus comprising: 1. A column from 20 to 90 mm in length for separation of the components of an aqueous sample solution, said column containing a spherical porous barrier comprising an ion exchange gel having particle size of 1 to 8 μm, a pore size less than 1000 A, an ion exchange capacity of 0.03 to 1.0 milliequivalents/g and a mechanical strength greater than 200 kg/cm 2 , 2. a detecting cell having a cell capacity less than 1.9 μl for detecting eluates from the separating column, 3. a detector operatively connected to the detecting cell, and 4. a constant flow, pulse free feeding pump for feeding an eluting solution to the separating column, said column, detector and pump being operatively connected, said separating column and detecting cell arranged in a thermostatic oven.
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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) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |