US3591464A
Expired / Lapsed
US
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Method and apparatus for detecting ionic activity
Assignee: Thermo Orion Inc
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Filing: 1968-09-06
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Granted: 1971-07-06
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Expires: 1988-09-06
Abstract
Abstract A POTENTIOMETRIC, SOLID STATE MEMBRANE TYPE ELECTRODE FOR DETECTING ION ACTIVITIES IN SOLUTION AND IN WHICH ELECTRODE THE ION-SENSITIVE ELEMENT IS AN IMPOROUS SOLID MEMBRANE HAVING A SURFACE INTENDED TO CONTACT THE SOLUTION. THE SURFACE COMPRISES AN INTIMATE MIXTURE OF AG2S AND ANOTHER COMPOUND SELECTED ACCORDING TO THE NATURE OF THE ION TO WHICH THE ELEMENT IS TO BE RESPONSIVE. FOR COPPER, LEAD, CADMIUM AND THIOCYANATE SENSITIVE ELEMENTS, THE LATTER COMPOUND IS RESPECTIVELY CUS, PBS, CDS AND AGSCN. ONE FORM OF THE MEMBRANE IS A COMPRESSED COPRECIPITATE OF THE REQUISITE SALTS FREE OF THE METALS OF WHICH THE SALTS ARE FORMED.
Inventors
- 👤 Martin S Frant
- 👤 James W Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:04
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)
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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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |