Patent US2791867A successfully refreshed from Google Patents.
Patent US3915829A successfully refreshed from Google Patents.
US3915829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical structure
Assignee: IL Holding Spa
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Filing: 1972-10-10
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Granted: 1975-10-28
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Expires: 1992-10-10
Abstract
Abstract An electrochemical system includes a first electrode for sensing a fluid sample to be analyzed and a reference electrode. The reference electrode is disposed in electrolyte and a membrane separates the electrolyte from the fluid sample. The membrane has a multiplicity of parallel passages, the width of each passage being less than one-half micron, such that the passages provide a multiplicity of similar ionic junctions between the electrolyte and the fluid sample.
Inventors
- 👤 William M Krebs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:50
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
212 words
A RESTRICTED FLOW LEAK JUNCTION STRUCTURE FOR USE IN AN ELECTROCHEMICAL ELECTRODE SYSTEM COMPRISING A FIRST STRUCTURE DEFINING A SAMPLE CHAMBER FOR MATERIAL TO BE ANALYZED, SAID SAMPLE CHAMBER HAVING AN OPENING THEREIN AND INCLUDING A SAMPLE FLOW PATH, A PORTION OF SAID SAMPLE FLOW PATH INCLUDING INLET AND OUTLET ARMS, SAID ARMS BEING DISPOSED AT AN ANGLE TO ONE ANOTHER, AND THE OPENING IN SAID SAMPLE CHAMBER BEING ADJACENT THE JUNCTION OF SAID ARMS, A SECOND STRUCTURE DEFINING A SECOND CHAMBER ADAPTED TO CONTAIN ELECTROLYTE, SAID SECOND CHAMBER HAVING AN OPENING THEREIN, AND A LEAK JUNCTION MEMBER HAVING A MULTIPLICITY OF RESTRICTED FLOW PASSAGES THERETHROUGH, SAID MEMBER BEING DISPOSED BETWEEN SAID OPENINGS IN SAID FIRST AND SECOND STRUCTURE SUCH THAT SAID RESTRICTED FLOW PASSAGES PROVIDE A MULTIPLICITY OF IONIC JUNCTION BETWEEN ELECTROLYTE IN SAID SECOND CHAMBER AND MATERIAL ID SAMPLE CHAMBER TO ESTABLISH A STABLE JUNCTION POTENTIAL BETWEEN SAID ELECTROLYTE AND MATERIAL IN SAID SAMPLE CHAMBER, A SURFACE OF EACH SAID ARM BEING CONTIGUOUS WITH AND DISPOSED AT AN OBTUSE ANGLE TO A SURFACE OF SAID LEAK JUNCTION MEMBER SUCH THAT CLEANING OF SAID SAMPLE FLOW PATH IS FACILITATED BY THE DYNAMIC FLOW OF SAMPLE MATERIAL OVER SAID SURFACE OF SAID LEAK JUNCTION MEMBER AND THE CONTIGUOUS SURFACES OF SAID ARMS.
Claim 2
Dependent Claim
212 words
A RESTRICTED FLOW LEAK JUNCTION STRUCTURE FOR USE IN AN ELECTROCHEMICAL ELECTRODE SYSTEM COMPRISING A FIRST STRUCTURE DEFINING A SAMPLE CHAMBER FOR MATERIAL TO BE ANALYZED, SAID SAMPLE CHAMBER HAVING AN OPENING THEREIN AND INCLUDING A SAMPLE FLOW PATH, A PORTION OF SAID SAMPLE FLOW PATH INCLUDING INLET AND OUTLET ARMS, SAID ARMS BEING DISPOSED AT AN ANGLE TO ONE ANOTHER, AND THE OPENING IN SAID SAMPLE CHAMBER BEING ADJACENT THE JUNCTION OF SAID ARMS, A SECOND STRUCTURE DEFINING A SECOND CHAMBER ADAPTED TO CONTAIN ELECTROLYTE, SAID SECOND CHAMBER HAVING AN OPENING THEREIN, AND A LEAK JUNCTION MEMBER HAVING A MULTIPLICITY OF RESTRICTED FLOW PASSAGES THERETHROUGH, SAID MEMBER BEING DISPOSED BETWEEN SAID OPENINGS IN SAID FIRST AND SECOND STRUCTURE SUCH THAT SAID RESTRICTED FLOW PASSAGES PROVIDE A MULTIPLICITY OF IONIC JUNCTION BETWEEN ELECTROLYTE IN SAID SECOND CHAMBER AND MATERIAL ID SAMPLE CHAMBER TO ESTABLISH A STABLE JUNCTION POTENTIAL BETWEEN SAID ELECTROLYTE AND MATERIAL IN SAID SAMPLE CHAMBER, A SURFACE OF EACH SAID ARM BEING CONTIGUOUS WITH AND DISPOSED AT AN OBTUSE ANGLE TO A SURFACE OF SAID LEAK JUNCTION MEMBER SUCH THAT CLEANING OF SAID SAMPLE FLOW PATH IS FACILITATED BY THE DYNAMIC FLOW OF SAMPLE MATERIAL OVER SAID SURFACE OF SAID LEAK JUNCTION MEMBER AND THE CONTIGUOUS SURFACES OF SAID ARMS.
Claim 3
Dependent Claim
27 words
The structure as claimed in claim 1 wherein said first and second structures are of electrically non-conductive material and said leak junction member is of polymeric material.
Claim 4
Dependent Claim
53 words
The structure as claimed in claim 1 wherein said leak junction member is a thin membrane that has a smooth surface exposed to said sample flow path, said passages are substantially equal in length, and the density of said passages in said leak junction member is at least about 108 per square centimeter.
Claim 5
Dependent Claim
59 words
The structure as claimed in claim 3 wherein the passage dimensions of said leak junction member are such that the flow rate of electrolyte from said second chamber to said first chamber through said passages is greater than zero but less than 0.1 microliter per minute per square millimeter of leak junction member area per centimeter head of electrolyte.
Claim 6
Dependent Claim
22 words
The structure as claimed in claim 4 wherein the electrical resistance of said leak junction member is less than one hundred ohms.
Claim 7
Dependent Claim
63 words
The structure as claimed in claim 5 and further including a sheet support member having a hole therein, said leak junction member being secured to said sheet support member and said leak junction member and said sheet support member being positioned between said first and second structures so that said hole is in alignment with said openings in said first and second members.
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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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |