US4960516A
Expired / Lapsed
US
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Liquid microcolumn chromatograph
Assignee: Individual
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Filing: 1987-06-16
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Granted: 1990-10-02
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Expires: 2007-06-16
Abstract
Abstract The liquid microcolumn chromatograph comprises a microcolumn (1), unit (2) for feeding eluent, made as a reservoir (3) separated by a "slack" diaphragm (4) into two half-chambers (5,6) one whereof communicates with a source (7) of pressure and the other is connected to a source (8) of eluent and to an inlet into the microcolumn (1) a flow-through cell (9), and an eluent-collecting vessel (14). The chromatograph is provided with an additional reservoir (10) separated by a "slack" diaphragm (11) into two half-chambers (12, 13) and is also provided with an additional source (15) of pressure, the half-chamber (12) being communicated with an outlet of the flow-through cell (9) and connected to the eluent-collecting vessel (14), whereas the half-chamber (13) communicates with the additional source (15) of pressure.
Inventors
- 👤 Maxim L. Alexandrov
- 👤 Boris G. Belenky
- 👤 Vladimir A. Gotlib
- 👤 Arkady P. Vlasov
- 👤 Nikolai N. Komarov
- 👤 Valery V. Sudiiin
- 👤 Vsevolod V. Shevkunov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:29
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/88; G01N30/26; G01N30/28; G01N30/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
A liquid microcolumn chromatograph comprising a microcolumn (1), a unit (2) for feeding eluent, said unit being made as a main reservoir (3) separated by a "slack" diaphragm (4) into two half-chambers (5, 6) of which one communicates with a main source (7) of pressure and is filled with a working agent, while the other is connected to a source (8) of eluent and to an inlet to the microcolumn (1), a flow-through cell (9) of a detector at the outlet of the microcolumn (1), and an eluent-collecting vessel (14), c h a r a c t e r i z e d in that it is provided with an additional vessel (10) whose volume is essentially greater than that of the eluent required for carrying out a single analysis, separated by a "slack" diaphragm (11) into two half-chambers (12, 13), and with an additional source (15) of pressure, the half-chamber (12) communicating with the outlet of the flow-through cell (9) of the detector and with the eluent-collecting vessel (14), whereas the half-chamber (13) is communicated with an additional source (15) of pressure.
Claim 2
Dependent Claim
183 words
A liquid microcolumn chromatograph comprising a microcolumn (1), a unit (2) for feeding eluent, said unit being made as a main reservoir (3) separated by a "slack" diaphragm (4) into two half-chambers (5, 6) of which one communicates with a main source (7) of pressure and is filled with a working agent, while the other is connected to a source (8) of eluent and to an inlet to the microcolumn (1), a flow-through cell (9) of a detector at the outlet of the microcolumn (1), and an eluent-collecting vessel (14), c h a r a c t e r i z e d in that it is provided with an additional vessel (10) whose volume is essentially greater than that of the eluent required for carrying out a single analysis, separated by a "slack" diaphragm (11) into two half-chambers (12, 13), and with an additional source (15) of pressure, the half-chamber (12) communicating with the outlet of the flow-through cell (9) of the detector and with the eluent-collecting vessel (14), whereas the half-chamber (13) is communicated with an additional source (15) of pressure.
Claim 3
Dependent Claim
78 words
A liquid microcolumn chromatograph according to claim 1, c h a r a c t e r i z e d in that the main and additional reservoirs (3, 10) are identical and the inner surface of the half-chambers (5, 6, 12, 13) thereof is a body of revolution, whereas the surface area of the "slack" diaphragm (4, 11) is equal to or greater than the area of the inner surface of the half-chamber (5, 6, 12, 13).
Claim 4
Dependent Claim
50 words
A microcolumn chromatograph according to claim 1 or 2, c h a r a c t e r i z e d in that in each half-chamber (5, 13), communicated with its source (7, 15) of pressure, a pickup of the position of the "slack" diaphragm (4, 11) is arranged.
Claim 5
Dependent Claim
126 words
A microcolumn chromatograph according to claim 3, c h a r a c t e r i z e d in that the pickup of the position of the "slack" diaphragm (4, 11) is made as a hollow cylindrical projection on the surface of the half-chamber (5, 13) and is equipped with signalling elements (20) monitoring two extreme positions of the "slack" diaphragm (4, 11), and a rod (21) whose one end is linked with the centre of the "slack" membrane (4, 11) and whose other end carries a signalling element (22) indicating a current position of the "slack" diaphragm (4, 11), said rod being movable within the projection (18) and interacting by its signalling element (22) with the signalling elements (20) of the projection 18.
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) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |