US3607700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode for measuring potassium and other specific ion activities
Assignee: Duke University
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Filing: 1967-12-20
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Granted: 1971-09-21
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Expires: 1987-12-20
Abstract
Abstract The direct and very rapid measurement of the activity of a particular chemical species of ion in an aqueous solution is achieved with an ion selective electrode embodying as the selective element a mechanically stable layer established between the aqueous solution and a nonaqueous phase, said layer being established by a surface active agent such as phospholipid, said layer also containing an ion selective macrocyclic compound such as valinomycin and said agent and macrocyclic compound being dissolved in a solvent which forms the nonaqueous phase. High selectivity for potassium ions, in particular, is achieved.
Inventors
- 👤 Daniel C Tosteson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:34
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
14 words
A system as claimed in claim 1 wherein said selected ions constitute potassium ions.
Claim 2
Dependent Claim
20 words
A system as claimed in claim 1 wherein said solvent is selected from the groups consisting of decane and bromobenzene.
Claim 3
Dependent Claim
14 words
A system as claimed in claim 1 wherein said support sheets are cellophane sheets.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |