US4490234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring ionic concentration utilizing an ion-sensing electrode
Assignee: Beckman Coulter Inc
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Filing: 1982-02-22
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Granted: 1984-12-25
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Expires: 2002-02-22
Abstract
Abstract A method for measuring the concentration of a gas. The method includes circulating an electrolyte solution between an electrode and a gas-permeable, ion-impermeable membrane spaced from said electrode. The ionic concentration is measured after the circulating electrolyte has been stopped.
Inventors
- 👤 Edmund E. Buzza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:10
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/4925
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A method for measuring the concentration of a substance in a sample liquid, said method utilizing an ion-sensing electrode including a permeable membrane spaced from said electrode, said space between said membrane and said electrode containing an electrolyte solution, said method comprising the steps of: premixing the sample liquid with a reagent to release said substance prior to contact with the permeable membrane; contacting said permeable membrane with said sample liquid; circulating said electrolyte solution through said space at a rate greater than said substance diffuses through said membrane; stopping said circulating electrolyte solution; and measuring said concentration.
Claim 2
Independent Claim
98 words
A method for measuring the concentration of a substance in a sample liquid, said method utilizing an ion-sensing electrode including a permeable membrane spaced from said electrode, said space between said membrane and said electrode containing an electrolyte solution, said method comprising the steps of: premixing the sample liquid with a reagent to release said substance prior to contact with the permeable membrane; contacting said permeable membrane with said sample liquid; circulating said electrolyte solution through said space at a rate greater than said substance diffuses through said membrane; stopping said circulating electrolyte solution; and measuring said concentration.
Claim 3
Dependent Claim
10 words
Method of claim 1 wherein said substance is carbon dioxide.
Claim 4
Dependent Claim
11 words
Method of claim 1 wherein said electrolyte includes a bicarbonate ion.
Claim 5
Dependent Claim
11 words
Method of claim 1 wherein said electrode is a pH electrode.
Claim 6
Dependent Claim
17 words
Method of claim 1 wherein said step of contacting includes stopping said sample substance adjacent said membrane.
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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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |