Patent US2745803A successfully refreshed from Google Patents.
US2745803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarographic electrode
Assignee: Leeds and Northrup Co
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Filing: 1952-04-24
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Granted: 1956-05-15
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Expires: 1972-04-24
Abstract
No abstract record available.
Inventors
- 👤 Leveque Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:49
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
POLAROGRAPHIC APPARATUS COMPRISING A CONTAINER FOR A SOLUTION UNDER TEST, AND ELONGATED METALLIC ELEMENT HAVING A SURFACE WETTABLE BY MERCURY FOR FLOW OF MERCURY ALONG THAT SURFACE, SUPPORTING MEANS FOR POSITIONING SAID ELEMENT WITHIN SAID CONTAINER WITH THE LOWER END OF SAID ELEMENT DISPOSED NEAR AND SPACED FROM THE BOTTOM OF SAID CONTAINER, SAID SUPPORTING MEANS INCLUDING WALLS CLOSELY SURROUNDING SAID ELEMENT AND FORMING A FLOW PASSAGE ABOUT THE UPPER END OF SAID ELONGATED ELEMENT, MEANS FOR SUPPLYING MERCURY TO SAID PASSAGE, THE SIZE OF THE AREA OF SAID PASSAGE BETWEEN SAID ELEMENT AND SAID WALLS RESTRICTING FLOW OF MERCURY ALONG SAID WETTABLE SURFACE TO SUCH A LOW RATE THAT ONLY DISCRETE DROPS OF MERCURY FORM AT, AND DETACH THEMSELVES FROM, THE LOWER END OF SAID ELEMENT, THE LENGTH OF SAID ELEMENT THROUGH THE SOLUTION UNDER TEST PROVIDING A MERCURIAL SURFACE SEVERAL TIMES GREATER THAN THAT OF THE AREA OF THE SUCCESIVE DROPS OF MERCURY WHICH DETACH THEMSELVES FROM THE LOWER END OF SAID ELEMENT.
Claim 2
Dependent Claim
165 words
POLAROGRAPHIC APPARATUS COMPRISING A CONTAINER FOR A SOLUTION UNDER TEST, AND ELONGATED METALLIC ELEMENT HAVING A SURFACE WETTABLE BY MERCURY FOR FLOW OF MERCURY ALONG THAT SURFACE, SUPPORTING MEANS FOR POSITIONING SAID ELEMENT WITHIN SAID CONTAINER WITH THE LOWER END OF SAID ELEMENT DISPOSED NEAR AND SPACED FROM THE BOTTOM OF SAID CONTAINER, SAID SUPPORTING MEANS INCLUDING WALLS CLOSELY SURROUNDING SAID ELEMENT AND FORMING A FLOW PASSAGE ABOUT THE UPPER END OF SAID ELONGATED ELEMENT, MEANS FOR SUPPLYING MERCURY TO SAID PASSAGE, THE SIZE OF THE AREA OF SAID PASSAGE BETWEEN SAID ELEMENT AND SAID WALLS RESTRICTING FLOW OF MERCURY ALONG SAID WETTABLE SURFACE TO SUCH A LOW RATE THAT ONLY DISCRETE DROPS OF MERCURY FORM AT, AND DETACH THEMSELVES FROM, THE LOWER END OF SAID ELEMENT, THE LENGTH OF SAID ELEMENT THROUGH THE SOLUTION UNDER TEST PROVIDING A MERCURIAL SURFACE SEVERAL TIMES GREATER THAN THAT OF THE AREA OF THE SUCCESIVE DROPS OF MERCURY WHICH DETACH THEMSELVES FROM THE LOWER END OF SAID ELEMENT.
References Cited (Backward Citations)
DE723185C
Cited
US2598228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |