Patent US2488212A successfully refreshed from Google Patents.
US3278408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical cell
Assignee: Beckman Coulter Inc
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Filing: 1962-12-19
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Granted: 1966-10-11
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Expires: 1982-12-19
Abstract
No abstract record available.
Inventors
- 👤 John E Leonard
- 👤 Watanabe Hideo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:51
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
197 words
A CELL FOR POLAROGRAPHIC ANALYSIS OF A CONSTITUENT IN A SAMPLE COMPRISING: A PAIR OF SPACED ELECTRODES ADAPTED TO BE JOINED BY AN ELECTROLYTE, ONE OF SAID ELECTRODES BEING A SENSING ELECTRODE WITH A FORWARD END; A FIRST MEMBRANE PERMEABLE TO SAID CONSTITUENT OVERLYING SAID FORWARD END OF SAID SENSING ELECTRODE, SAID FIRST MEMBRANE BEING SUBJECT TO APPRECIABLE COLD FLOW WHEN TENSION IS APPLIED THERETO; A SECOND MEMBRANE OVERLYING SAID FIRST MEMBRANE AND SAID PAIR OF ELECTRODES, SAID SECOND MEMBRANE HAVING A COMPOSITION DIFFERENT FROM SAID FIRST MEMBRANE AND BEING SUBSTANTIALLY MORE PERMEABLE TO SAID CONSTITUENT THAN SAID FIRST MEMBRANE, SAID SECOND MEMBRANE BEING ELASTOMERIC AND ESSENTIALLY FREE OF COLD FLOW WHEN TENSION IS APPLIED THERETO; CLAMPING MEANS SURROUNDING SAID ELECTRODES AND POSITIONED BEHIND SAID FORWARD END OF SAID SENSING ELECTRODE, SAID CLAMPING MEANS HOLDING SAID SECOND MEMBRANE UNDER TENSION OVER SAID FIRST MEMBRANE AND SAID SENSING ELECTRODE WHEREBY SAID FIRST MEMBRANE IS HELD IN CLOSE PROXIMITY TO SAID FORWARD END OF SAID SENSING ELECTRODE; AND SAID MEMBRANE BEING POSITIONED ENTIRELY FORWARDLY OF SAID CLAMPING MEANS AND HAVING ITS OUTER EDGE SPACED FROM SAID CLAMPING MEANS WHEREBY SAID CLAMPING MEANS APPLIES NO TENSIION TO SAID FIRST MEMBRANE.
Claim 2
Dependent Claim
197 words
A CELL FOR POLAROGRAPHIC ANALYSIS OF A CONSTITUENT IN A SAMPLE COMPRISING: A PAIR OF SPACED ELECTRODES ADAPTED TO BE JOINED BY AN ELECTROLYTE, ONE OF SAID ELECTRODES BEING A SENSING ELECTRODE WITH A FORWARD END; A FIRST MEMBRANE PERMEABLE TO SAID CONSTITUENT OVERLYING SAID FORWARD END OF SAID SENSING ELECTRODE, SAID FIRST MEMBRANE BEING SUBJECT TO APPRECIABLE COLD FLOW WHEN TENSION IS APPLIED THERETO; A SECOND MEMBRANE OVERLYING SAID FIRST MEMBRANE AND SAID PAIR OF ELECTRODES, SAID SECOND MEMBRANE HAVING A COMPOSITION DIFFERENT FROM SAID FIRST MEMBRANE AND BEING SUBSTANTIALLY MORE PERMEABLE TO SAID CONSTITUENT THAN SAID FIRST MEMBRANE, SAID SECOND MEMBRANE BEING ELASTOMERIC AND ESSENTIALLY FREE OF COLD FLOW WHEN TENSION IS APPLIED THERETO; CLAMPING MEANS SURROUNDING SAID ELECTRODES AND POSITIONED BEHIND SAID FORWARD END OF SAID SENSING ELECTRODE, SAID CLAMPING MEANS HOLDING SAID SECOND MEMBRANE UNDER TENSION OVER SAID FIRST MEMBRANE AND SAID SENSING ELECTRODE WHEREBY SAID FIRST MEMBRANE IS HELD IN CLOSE PROXIMITY TO SAID FORWARD END OF SAID SENSING ELECTRODE; AND SAID MEMBRANE BEING POSITIONED ENTIRELY FORWARDLY OF SAID CLAMPING MEANS AND HAVING ITS OUTER EDGE SPACED FROM SAID CLAMPING MEANS WHEREBY SAID CLAMPING MEANS APPLIES NO TENSIION TO SAID FIRST MEMBRANE.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |