US4364806A
Expired / Lapsed
US
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Gas electrode shutdown procedure
Assignee: Diamond Shamrock Chemicals Co
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Filing: 1981-05-08
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Granted: 1982-12-21
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Expires: 2001-05-08
Abstract
Abstract This disclosure is directed to a shutdown procedure for use in gas electrodes, e.g., oxygen (air) cathodes, which comprises imposing a nitrogen purge on the cell containing said electrode upon power shutdown and maintaining this nitrogen atmosphere (blanket) during the period of the shutdown. It has been discovered that the use of this procedure enables maintaining of the low voltage operation achieved prior to power shutdown upon restart of the cell when the power has been restored.
Inventors
- 👤 Douglas K. Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:46
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/095; C25B15/00; C25B15/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
In a gas electrode shutdown procedure where an electrode oxidizable when not protected by electrical polarity is operating on a given gas supply in an electrolytic cell at a given operating voltage and the cell is deprived of electrical power, the improvement comprising feeding nitrogen gas to said cell to establish a nitrogen atmosphere (blanket) therein and maintaining same for the duration of the power outage to said cell.
Claim 2
Dependent Claim
69 words
In a gas electrode shutdown procedure where an electrode oxidizable when not protected by electrical polarity is operating on a given gas supply in an electrolytic cell at a given operating voltage and the cell is deprived of electrical power, the improvement comprising feeding nitrogen gas to said cell to establish a nitrogen atmosphere (blanket) therein and maintaining same for the duration of the power outage to said cell.
Claim 3
Dependent Claim
15 words
The improved procedure as in claim 1 wherein said electrode is an oxygen (air) cathode.
Claim 4
Dependent Claim
12 words
The improved procedure as in claim 2 wherein said gas is oxygen.
Claim 5
Dependent Claim
15 words
The improved procedure as in claim 2 wherein said gas is CO 2 -free air.
Claim 6
Dependent Claim
32 words
The improved procedure as in claim 2 wherein said oxygen (air) cathode is a laminate of a wetproofing layer containing polytetrafluoroethylene particles, an active layer containing carbon particles and a current distributor.
Claim 7
Dependent Claim
16 words
The improved procedure as in claim 5 wherein said carbon particles contain a precious metal catalyst.
Claim 8
Dependent Claim
13 words
The improved procedure as in claim 6 wherein said precious metal comprises platinum.
Claim 9
Dependent Claim
13 words
The improved procedure as in claim 6 wherein said precious metal comprises silver.
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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |