Patent US4053382A successfully refreshed from Google Patents.
US4053382A
Expired / Lapsed
US
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Liquid junction of reference electrode
Assignee: Horiba Ltd
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Filing: 1976-02-06
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Granted: 1977-10-11
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Expires: 1996-02-06
Abstract
Abstract An improved liquid junction for a reference electrode is provided. It is characterized by forming a hydrophilic layer by treatment of only the surface of a liquid junction of a polymer of tetrafluoroethylene.
Inventors
- 👤 Hiroshi Maruyama
- 👤 Masashi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:11
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/40; G01N27/401
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
46 words
In a reference electrode comprising an internal electrode, an internal liquid and a liquid junction structure for separating said internal liquid from a liquid sample to be measured, the improvement wherein said junction structure comprises polytetrafluoroethylene having a hydrophillic layer on the liquid junction surfaces thereof.
Claim 2
Dependent Claim
46 words
In a reference electrode comprising an internal electrode, an internal liquid and a liquid junction structure for separating said internal liquid from a liquid sample to be measured, the improvement wherein said junction structure comprises polytetrafluoroethylene having a hydrophillic layer on the liquid junction surfaces thereof.
Claim 3
Dependent Claim
19 words
A reference electrode according to claim 1 wherein the liquid junction is disposed at the base of said electrode.
Claim 4
Dependent Claim
20 words
A reference electrode according to claim 1 wherein the liquid junction is disposed at the side wall of said electrode.
Claim 5
Dependent Claim
20 words
A reference electrode according to claim 1 wherein the hydrophylic layer is formed by the reaction of sodium on polytetrafluoroethylene.
Claim 6
Dependent Claim
18 words
A reference electrode according to claim 4 wherein said reaction is performed in an organic solvent comprising naphthalene.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |