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Patent US4218299A successfully refreshed from Google Patents.
US4218299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short path liquid junction structure for electrochemical electrodes
Assignee: Beckman Coulter Inc
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Filing: 1979-07-06
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Granted: 1980-08-19
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Expires: 1999-07-06
Abstract
Abstract A short path liquid junction structure is defined through a porous ceramic layer coated circumferentially on an electrochemical electrode glass body by an elastomeric O-ring sealing member circumferentially engaging the ceramic layer in an annular line contact seal. The length of the liquid junction path is the short distance through the porous ceramic layer around and past the line contact seal.
Inventors
- 👤 Grover F. Lindell
- 👤 George Matsuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:16
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/36; G01N27/403; G01N27/4035
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
In an electrochemical electrode assembly including a nonconductive container having an opening receiving and surrounding a tubular or solid glass body, a coating of porous ceramic bonded to an outer circumferential surface of the glass body and extending axially thereon to provide a liquid junction path through which electrolytic communication is established between an electrolyte within the electrode assembly and a solution to be tested, an improved arrangement for closing the container opening comprising: an annular sealing member having a sealing surface circumferentially engaging and sealing against the porous ceramic coating, the sealing surface being of arcuate configuration in axial cross-section to establish a generally annular line contact seal around the circumferential surface of the porous ceramic coating whereby a short path liquid junction is defined in the axial direction exclusively through the porous ceramic coating for the relatively short distance traversing the annular line contact seal.
Claim 2
Dependent Claim
147 words
In an electrochemical electrode assembly including a nonconductive container having an opening receiving and surrounding a tubular or solid glass body, a coating of porous ceramic bonded to an outer circumferential surface of the glass body and extending axially thereon to provide a liquid junction path through which electrolytic communication is established between an electrolyte within the electrode assembly and a solution to be tested, an improved arrangement for closing the container opening comprising: an annular sealing member having a sealing surface circumferentially engaging and sealing against the porous ceramic coating, the sealing surface being of arcuate configuration in axial cross-section to establish a generally annular line contact seal around the circumferential surface of the porous ceramic coating whereby a short path liquid junction is defined in the axial direction exclusively through the porous ceramic coating for the relatively short distance traversing the annular line contact seal.
Claim 3
Dependent Claim
184 words
In an electrochemical electrode assembly including a first glass tubular body having an open end generally coaxially receiving and surrounding a second glass tubular or solid body, a coating of porous ceramic bonded to one or both of (1) the outer annular surface of the second glass body, and (2) the inner annular surface of the first glass body and extending axially therealong to provide a liquid junction structure establishing electrolytic communication between an electrolyte within the electrode assembly and a solution to be tested, an improved arrangement surrounding the second glass body for closing the container opening comprising: an annular sealing member having inner and outer annular sealing surfaces one or each of which circumferentially engage and seal against a respective coating of porous ceramic, each sealing surface(s) so engaged being of arcuate configuration in axial cross-section to establish a generally annular line contact seal with the circumferential surface of the porous ceramic coating(s) whereby a short path liquid junction is defined in the axial direction exclusively through the porous ceramic coating(s) for the relatively short distance traversing the annular line contact seal.
Claim 4
Dependent Claim
184 words
In an electrochemical electrode assembly including a first glass tubular body having an open end generally coaxially receiving and surrounding a second glass tubular or solid body, a coating of porous ceramic bonded to one or both of (1) the outer annular surface of the second glass body, and (2) the inner annular surface of the first glass body and extending axially therealong to provide a liquid junction structure establishing electrolytic communication between an electrolyte within the electrode assembly and a solution to be tested, an improved arrangement surrounding the second glass body for closing the container opening comprising: an annular sealing member having inner and outer annular sealing surfaces one or each of which circumferentially engage and seal against a respective coating of porous ceramic, each sealing surface(s) so engaged being of arcuate configuration in axial cross-section to establish a generally annular line contact seal with the circumferential surface of the porous ceramic coating(s) whereby a short path liquid junction is defined in the axial direction exclusively through the porous ceramic coating(s) for the relatively short distance traversing the annular line contact seal.
Claim 5
Dependent Claim
20 words
The electrode assembly of claim 1 or claim 2 wherein the annular sealing member is an O-ring of elastomeric material.
Claim 6
Dependent Claim
16 words
The electrode assembly of claim 3 wherein the O-ring elastomeric material comprises silicone rubber or neoprene.
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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |