Patent US3577332A successfully refreshed from Google Patents.
US3577332A
Expired / Lapsed
US
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Polarographic cell
Assignee: Beckman Coulter Inc
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Filing: 1967-07-12
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Granted: 1971-05-04
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Expires: 1987-07-12
Abstract
Abstract A CELL FOR POLARGRAPHIC ANALYSIS OF THE TYPE EMPLOYING A PAIR OF ELECTRODES JOINED BY AN ELECTROLYTE AND SEPARATED FROM THE SAMPLE MEDIUM BY A SELECTIVELY PERMEABLE MEMBRANE. PRESSURE COMPENSATION IS PROVIDED FOR THE CELL BY EMPLOYING AN ION IMPERMEABLE BARRIER WHICH CLOSES A PASSAGE LEADING TO THE ELETROLYTE RESERVOIR IN THE CELL SO THAT CONTAMINANTS OUTSIDE OF THE CELL CANNOT REACH THE ELECTROLYTE RESERVOIR. THE BARRIER HAS A SENSITIVITY TO PRESSURE CHANGES GREATER THAN THAT OF THE MEMBRANE SO THAT THE SPACIAL RELATIONSHIP BETWEEN THE MEMBRANE AND THE SENSING ELECTRODE OF THE CELL IS NOT INFLUENCED BY CHANGING PRESSURE CONDITIONS.
Inventors
- 👤 Joe A Porter
- 👤 Steuart L Couch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:16
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |