US2720472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of pickling iron and recovering pickling agent
Assignee: Cleveland Industrial Resesarch Inc
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Filing: 1953-08-20
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Granted: 1955-10-11
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Expires: 1973-08-20
Abstract
No abstract record available.
Inventors
- 👤 Clark O Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:08
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/36; Y; Y10; Y10S; Y10S423/00; Y10S423/01; Y10S423/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR PICKLING FERROUS METAL WHICH COMPRISES THE STEPS OF IMMERSING SAID METAL IN AN AQUEOUS PICKLING BATH OF AN ALKALI METAL ACID SULPHATE SELECTED FROM THE GROUP CONSISTING OF SODIUM ACID SULPHATE AND POTASSIUM ACID SULPHATE TO YIELD FERROUS ALKALI METAL SULPHATE IN AQUEOUS SOLUTION, THEN BY A PROCESS INCLUDING THE STEP OF OXIDATION AND RAISING THE PH TO AT LEAST 7 WITH AN AMMONIACONTAINING FLUID, THEREBY CONVERTING SAID FERROUS ALKALI METAL SULPHATE TO OXIDE OF IRON AND THE CORRESPONDING ALKALI METAL AMMONIUM SULPHATE, RECOVERING SAID ALKALI METAL AMMONIUM SULPHATE FROM THE RESULTING SOLUTION, AND HEATING SAID ALKALI METAL AMMONIUM SULPHATE TO CONVERT IT TO THE CORRESPONDING ALKALI METAL ACID SULPHATE AND RETURNING SAID ACID SULPHATE TO THE PICKLING OPERATION
Claim 2
Dependent Claim
122 words
A PROCESS FOR PICKLING FERROUS METAL WHICH COMPRISES THE STEPS OF IMMERSING SAID METAL IN AN AQUEOUS PICKLING BATH OF AN ALKALI METAL ACID SULPHATE SELECTED FROM THE GROUP CONSISTING OF SODIUM ACID SULPHATE AND POTASSIUM ACID SULPHATE TO YIELD FERROUS ALKALI METAL SULPHATE IN AQUEOUS SOLUTION, THEN BY A PROCESS INCLUDING THE STEP OF OXIDATION AND RAISING THE PH TO AT LEAST 7 WITH AN AMMONIACONTAINING FLUID, THEREBY CONVERTING SAID FERROUS ALKALI METAL SULPHATE TO OXIDE OF IRON AND THE CORRESPONDING ALKALI METAL AMMONIUM SULPHATE, RECOVERING SAID ALKALI METAL AMMONIUM SULPHATE FROM THE RESULTING SOLUTION, AND HEATING SAID ALKALI METAL AMMONIUM SULPHATE TO CONVERT IT TO THE CORRESPONDING ALKALI METAL ACID SULPHATE AND RETURNING SAID ACID SULPHATE TO THE PICKLING OPERATION
References Cited (Backward Citations)
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US1754358A
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US2218117A
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US2694657A
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US2700004A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |