Patent US4149948A successfully refreshed from Google Patents.
US4149948A
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US
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Electrochemical cell for detecting hydrogen sulphide in a gaseous mixture
Assignee: Bayer AG
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Filing: 1977-11-18
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Granted: 1979-04-17
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Expires: 1997-11-18
Abstract
Abstract An electrochemical cell suitable for detecting traces of hydrogen sulphide in a gaseous mixture. Silver / silver sulphide electrodes are embedded in a polarographic arrangement in a gel-like electrolyte wherein the film adjacent to the auxiliary electrode contains a depolarizer. The gas detector is characterized by freedom from the need for maintenance and a high sensitivity which remains constant for a long period.
Inventors
- 👤 Otto Petersen
- 👤 Hans-Dieter Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:16
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/4045; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0036; G01N33/0044
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
An electrochemical cell for detecting hydrogen sulphide in a gaseous mixture comprising a work electrode, a reference electrode, an auxiliary electrode and an organic electrically conductive electrolyte, said work electrode and said reference electrode being silver/silver sulphide electrodes and the electrolyte comprising two gel-like films one of which is adjacent the auxiliary electrode and the other of which having the reference and work electrodes therein, the two films being of identical composition except that the film adjacent the auxiliary electrode contains a depolarizer.
Claim 2
Dependent Claim
83 words
An electrochemical cell for detecting hydrogen sulphide in a gaseous mixture comprising a work electrode, a reference electrode, an auxiliary electrode and an organic electrically conductive electrolyte, said work electrode and said reference electrode being silver/silver sulphide electrodes and the electrolyte comprising two gel-like films one of which is adjacent the auxiliary electrode and the other of which having the reference and work electrodes therein, the two films being of identical composition except that the film adjacent the auxiliary electrode contains a depolarizer.
Claim 3
Dependent Claim
47 words
An electrochemical cell according to claim 1, wherein the electrolyte is composed of from 10 to 20% by weight of polyvinyl chloride, 20 to 30% by weight of propylene carbonate, from 50 to 60% by weight of diethyl pththalate and about 1% by weight of potassium hexafluorophosphate.
Claim 4
Dependent Claim
27 words
An electrochemical cell according to claim 2, wherein the film adjacent the auxiliary electrode contains from 2 to 10% by weight of lead dioxide or said depolarizer.
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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |