US3219556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion measurement apparatus and method
Assignee: Beckman Coulter Inc
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Filing: 1961-12-26
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Granted: 1965-11-23
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Expires: 1981-12-26
Abstract
No abstract record available.
Inventors
- 👤 Edwin P Arthur
- 👤 John E Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:49
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
91 words
IN A SYSTEM FOR MEASURING THE ION CONCENTRATION OF A SAMPLE, COMBINATION OF: A REFERENCE ELECTRODE; A SENSING ELECTRODE HAVING A PORTION THEREOF FORMED OF A DOPED SEMICONDUCTOR MATERIAL; AND AN ELECTRICAL CIRCUIT CONNECTION SAID ELECTRODES AND HAVING MEANS FOR MEASURING THE EQUILIBRIUM ELECTRICAL POTENTIAL DEVELOPED AT THE JUNCTION OF THE SURFACE OF THE SEMICONDUCTOR MATERIAL AND THE LIQUID AS A FUNCTION OF THE ION CONCENTRATION IN THE LIQUID, SAID CIRCUIT BEING FREE OF ANY MEANS ASSOCIATED THEREWITH OTHER THAN SAID ELECTRODES AND SAMPLE FOR DRIVING A CURRENT THROUGH SAID ELECTRODES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |