Patent US3672962A successfully refreshed from Google Patents.
US3672962A
Expired / Lapsed
US
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Ion-sensitive electrode and method of making and using same
Assignee: Thermo Orion Inc
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Filing: 1971-03-17
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Granted: 1972-06-27
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Expires: 1991-03-17
Abstract
Abstract A POTENTIOMETRIC TYPE ELECTRODE FOR DETECTING SULFIDE ION ACTIVITY IN SOLUTION, AND METHODS OF MAKING AND USING SAME. THE ELECTRODE HAS, AS ITS ION-SENSITIVE ELEMENT, A MEMBRANE OF SUBSTANTIALLY IMPOROUS, HIGH PURITY SILVER SULFIDE SUBSTANTIALLY FREE OF METALLIC SILVER. THE MEMBRANE IS PREFERABLY MADE BY COMPRESSING SILVER SULFIDE POWDER TO FORM AN IMPOROUS SHEET OR PELLET. THE MEMBRANE IS USED BY CONTACTING ONE SURFACE TO A REFERENCE ELECTRODE AT A FIXED OTENTIAL WHILE CONTACTING THE OTHER SURFACE WITH THE TEST SOLUTION, THUS CREATING A HALF-CELL ACROSS WHICH VOLTAGE WILL VARY AS A FUNCTION OF ION-ACTIVITY IN THE TEST SOLUTION IN A NERNSTIAN MANNER.
Inventors
- 👤 Martin S Frant
- 👤 James W Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:50
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333
Claims Analysis
Total Claims: 0
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |