US3725236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical oxygen demand apparatus
Assignee: Honeywell Inc
•
Filing: 1970-09-24
•
Granted: 1973-04-03
•
Expires: 1990-09-24
Abstract
Abstract A non-biological method of exhaustive electrochemical oxidation utilizing an apparatus for forming oxygen in an aqueous sample through exhaustive electrolysis by a current flow between a pair of electrodes to oxidize the organic material in the sample in combination with an electrochemical oxidation of the organic material at an electrode immersed in the sample. The separate products of the electrolysis at the respective electrodes are collected, and the partial pressures thereof are measured by a differential pressure measuring means to provide an indication of the oxygen demand when correlated with an electrolysis of a reference fluid sample.
Inventors
- 👤 J Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:39
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/1806; G01N27/00; G01N27/26; G01N27/416; G01N27/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
The system as set forth in claim 1 and wherein said selectively permeable means is an ion permeable membrane.
Claim 2
Dependent Claim
34 words
The system as claimed in claim 1 wherein said anode enclosure and said cathode enclosure are arranged in a side-by-side relationship with a common wall therebetween, said common wall having said communicating port therein.
Claim 3
Dependent Claim
25 words
The system as set forth in claim 1 wherein said anode enclosure and cathode enclosure are nested concentric cylinders with a fluid receiving space therebetween.
Claim 4
Dependent Claim
61 words
The system as set forth in claim 1 wherein said first fluid admitting means in said cell means includes a standpipe means, first valve means coupling said standpipe to said anode enclosure for filling said anode enclosure to the level indicated on said standpipe and second valve means arranged to connect said standpipe means to a source of a test fluid.
Claim 5
Dependent Claim
50 words
The system as set forth in claim 1 wherein said pressure measuring means includes means for compensating the operation of said pressure measuring means for a temperature change of the test fluid sample in said anode enclosure and for a temperature change of the reference fluid in said cathode enclosure.
Claim 6
Dependent Claim
151 words
The system as set forth in claim 6 wherein said compensating means includes a first fluid-tight bulb having a liquid therein and being immersed in the test fluid sample in said anode enclosure, a first capillary tube connecting a vapor pressure developed by said liquid to said differential pressure measuring means, a second fluid-tight bulb having a liquid therein and being immersed in the reference fluid in said cathode enclosure and a second capillary tubing connecting a vapor pressure developed by said liquid in said second bulb to said differential pressure measuring means, said first capillary tubing being connected to said differential pressure measuring means to eliminate the effect of a temperature change of said test fluid sample in said anode compartment and said second capillary tubing being connected to said differential pressure measuring means to eliminate the effect of a temperature change of said reference fluid in said cathode enclosure.
Claim 7
Dependent Claim
51 words
The system as set forth in claim 1 and said second fluid admitting means includes a valve means arranged to be connected to a source of the reference fluid, said valve means being connected to said cathode enclosure to selectively admit a reference fluid from said source to said cathode enclosure.
Claim 8
Dependent Claim
30 words
The system as set forth in claim 1 and including selectively operable valve means for draining said test fluid sample from said anode compartment after completion of a test thereon.
References Cited (Backward Citations)
US1230803A
Cited
US2773497A
Cited
US2927888A
Cited
US3045665A
Cited
US3330755A
Cited
US3256164A
Cited
US3411998A
Cited
US3527687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |