US3616409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode system for measuring ion activities in stream or sample
Assignee: Duke University
•
Filing: 1968-06-07
•
Granted: 1971-10-26
•
Expires: 1988-06-07
Abstract
Abstract Continuous measurement of the activity of a particular chemical species of ion in a continuously flowing aqueous solution is obtained in a closed electrode system in which the flow is directed past a sensing electrode, the sensing electrode being convertible to measuring similar activity in static solutions. The selective element embodies a mechanically stable layer which contains an ion selective macrocyclic compound and which layer is established by a surface active agent between the aqueous solution and a nonaqueous phase, the agent and compound being dissolved in a solvent to form the nonaqueous phase.
Inventors
- 👤 Daniel C Tosteson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:27
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
A system as claimed in claim 1 wherein said container includes a first base member providing said conduit means and a second member providing said chamber and mounting said membrane means and being removable from the first member, said second member being further formed in the manner of a reference electrode and when removed from said base member being adapted when dipped in a static said aqueous solution to establish said layer contact and produce said voltage, thus adapting said second member for utility in both Static and stream measurements.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |