US3223620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition
Assignee: ChampionX LLC
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Filing: 1963-07-09
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Granted: 1965-12-14
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Expires: 1983-07-09
Abstract
No abstract record available.
Inventors
- 👤 Alfred W Oberhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:33
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/185; B; B01; B01J; B01J49/00; B01J49/05; B01J49/07; C01; C01G; C01G37/00; C01G37/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
205 words
A PROCESS FOR MAINTAINING A NON-CORROSIVE ENVIRONMENT IN INDUSTRIAL PROCESS WATER SYSTEMS WHICH COMPRISES THE STEPS OF TREATING SAID SYSTEMS WITH A CHROMATE BASED CORROSION INHIBITOR TO PROVIDE A CHROMATE DOSAGE, EXPRESSED AS CRO3, GREATER THAN 1 PART PER MILLION, BUT NOT IN EXCESS OF 1,000 PARTS PER MILLION, MAINTAINING THE PH WITHIN THE RANGE OF FROM 5.0-8.0, CONTINUING THE OPERATION OF SAID SYSTEMS UNTIL THE DISSOLVED SOLIDS BUILD UP EXCESSIVELY, REMOVING AT LEAST A PORTION OF THE WATER CONTAINED IN SAID SYSTEM TO PROVIDE A BLOWDOWN FRACTION, ADJUSTING THE PH OF THIS BLOWDOWN FRACTION TO NOT GREATER THAN 6.5, CONTACTING THIS BLOWDOWN FRACTION WITH A STRONG BASE ANION EXCHANGE RESIN WHICH HAS AS ITS EXCHANGEABLE ANION THE ANION OF A STRONG MINERAL ACID WHEREBY THE CHROMATES CONTAINED IN THE BLOWDOWN FRACTION ARE SELECTIVELY RETAINED BY THE RESIN THEREBY FORMING A CHROMATE FREE FRACTION, DISCARDING THE CHROMATE FREE FRACTION, CONTINUING TO CONTACT THE ANION EXCHANGE RESIN WITH BLOWDOWN FRACTION UNTIL THE RESIN IS SUBSTANTIALLY EXHAUSTED RESIN AT LEAST ONE WITH THE SAME MINERAL ACID SALT SOLUTION WHICH HAS A PH OF AT LEAST 8.5, COLLECTING THE CHROMATE REMOVED FROM THE STRONG BASE ANION RESIN, AND THEN RETURNING THE COLLECTED CHROMATE TO THE SYSTEM FOR REUSE.
Claim 2
Dependent Claim
205 words
A PROCESS FOR MAINTAINING A NON-CORROSIVE ENVIRONMENT IN INDUSTRIAL PROCESS WATER SYSTEMS WHICH COMPRISES THE STEPS OF TREATING SAID SYSTEMS WITH A CHROMATE BASED CORROSION INHIBITOR TO PROVIDE A CHROMATE DOSAGE, EXPRESSED AS CRO3, GREATER THAN 1 PART PER MILLION, BUT NOT IN EXCESS OF 1,000 PARTS PER MILLION, MAINTAINING THE PH WITHIN THE RANGE OF FROM 5.0-8.0, CONTINUING THE OPERATION OF SAID SYSTEMS UNTIL THE DISSOLVED SOLIDS BUILD UP EXCESSIVELY, REMOVING AT LEAST A PORTION OF THE WATER CONTAINED IN SAID SYSTEM TO PROVIDE A BLOWDOWN FRACTION, ADJUSTING THE PH OF THIS BLOWDOWN FRACTION TO NOT GREATER THAN 6.5, CONTACTING THIS BLOWDOWN FRACTION WITH A STRONG BASE ANION EXCHANGE RESIN WHICH HAS AS ITS EXCHANGEABLE ANION THE ANION OF A STRONG MINERAL ACID WHEREBY THE CHROMATES CONTAINED IN THE BLOWDOWN FRACTION ARE SELECTIVELY RETAINED BY THE RESIN THEREBY FORMING A CHROMATE FREE FRACTION, DISCARDING THE CHROMATE FREE FRACTION, CONTINUING TO CONTACT THE ANION EXCHANGE RESIN WITH BLOWDOWN FRACTION UNTIL THE RESIN IS SUBSTANTIALLY EXHAUSTED RESIN AT LEAST ONE WITH THE SAME MINERAL ACID SALT SOLUTION WHICH HAS A PH OF AT LEAST 8.5, COLLECTING THE CHROMATE REMOVED FROM THE STRONG BASE ANION RESIN, AND THEN RETURNING THE COLLECTED CHROMATE TO THE SYSTEM FOR REUSE.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |