US3379629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for automatically controlling corrosion of process vessels
Assignee: ConocoPhillips Co
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Filing: 1965-02-08
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Granted: 1968-04-23
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Expires: 1985-02-08
Abstract
No abstract record available.
Inventors
- 👤 William P Banks
- 👤 Norman L Conger
- 👤 Carl E Locke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:13
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN A METHOD OF MAINTAINING PASSIVITY IN A METALLIC VESSEL CONTAINING A CORROSIVE, ELECTROLYTIC SOLUTION WHEREIN THE POTENTIAL OF THE VESSEL AT WHICH THE MINIMUM RATE OF CORROSION OCCURS CHANGES WITH TIME, COMPRISING: PLACING AN INERT ELECTRODE IN THE SOLUTION; IMPOSING A POTENTIAL ACROSS THE INERT ELECTRODE AS THE CATHODE AND THE VESSEL AS THE ANODE; SENSING THE RATE OF CURRENT FLOW BETWEEN THE VESSEL AND THE ELECTRODE; INCREASING THE POTENTIAL BETWEEN THE VESSEL AND THE ELECTRODE UNTIL THE RATE OF CURRENT FLOW THROUGH THE SOLUTION BETWEEN THE VESSEL AND THE ELECTRODE REACHES A PREDETERMINED MAXIMUM, AND, ALTERNATELY, DECREASING THE POTENTIAL BETWEEN THE VESSEL AND THE ELECTRODE UNTIL THE RATE OF CURRENT FLOW THROUGH THE SOLUTION BETWEEN THE VESSEL AND THE ELECTRODE AGAIN REACHES SAID PREDETERMINED MAXIMUM, WHEREY THE POTENTIAL OF THE VESSEL WILL BE MAINTAINED IN A RANGE OF MINIMUM CORROSION.
Claim 2
Dependent Claim
142 words
IN A METHOD OF MAINTAINING PASSIVITY IN A METALLIC VESSEL CONTAINING A CORROSIVE, ELECTROLYTIC SOLUTION WHEREIN THE POTENTIAL OF THE VESSEL AT WHICH THE MINIMUM RATE OF CORROSION OCCURS CHANGES WITH TIME, COMPRISING: PLACING AN INERT ELECTRODE IN THE SOLUTION; IMPOSING A POTENTIAL ACROSS THE INERT ELECTRODE AS THE CATHODE AND THE VESSEL AS THE ANODE; SENSING THE RATE OF CURRENT FLOW BETWEEN THE VESSEL AND THE ELECTRODE; INCREASING THE POTENTIAL BETWEEN THE VESSEL AND THE ELECTRODE UNTIL THE RATE OF CURRENT FLOW THROUGH THE SOLUTION BETWEEN THE VESSEL AND THE ELECTRODE REACHES A PREDETERMINED MAXIMUM, AND, ALTERNATELY, DECREASING THE POTENTIAL BETWEEN THE VESSEL AND THE ELECTRODE UNTIL THE RATE OF CURRENT FLOW THROUGH THE SOLUTION BETWEEN THE VESSEL AND THE ELECTRODE AGAIN REACHES SAID PREDETERMINED MAXIMUM, WHEREY THE POTENTIAL OF THE VESSEL WILL BE MAINTAINED IN A RANGE OF MINIMUM CORROSION.
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) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |