Patent US2709143A successfully refreshed from Google Patents.
US2709143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for pickling and for recovering spent acid solutions
Assignee: United States Steel Corp
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Filing: 1948-08-13
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Granted: 1955-05-24
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Expires: 1968-08-13
Abstract
No abstract record available.
Inventors
- 👤 Charies B Francis
- 👤 Lynch Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:03
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE METHOD OF CONTINUOUSLY PICKLING STEEL WHICH COMPRISES REMOVING THE SPENT ACID SOLUTION FROM THE ENTRY END OF THE PICKLING LINE, EXPOSING THE SOLUTION OF AIR AT ATMOSPHERIC TEMPERATURE TO COOL THE LIQUID TO A TEMPERATURE BELOW 110* F., EXPANDING COMPRESSED AIR COOLED TO A LEAST APPROXIMATELY-100* F. INTO A CHAMBER CONTAINING THE PARTIALLY COOLED LIQUID TO COOL THE LIQUID TO A TEMPERATURE BELOW 20* F., COLLECTING THE COLD SOLUTION AND PERMITTING IT TO STAND UNTIL SALT CRYSTALS OF THE DESIRED SIZE HAVE FORMED, SEPARATING THE CRYSTALS FROM THE DESIRED SIZE HAVE FORMED, SEPARATING THE CRYSTALS FROM THE LIQUIDS, RATED BY EXPOSING IT TO THE COMPRESSED AIR PRIOR TO ITS EXPANSION INTO THE CHAMBER, RETURNING THE REHEATED SOLUTION INTO THE OPPOSITE END OF THE PICKLING LINE AND PASSING STEEL THROUGH THE PICKLING LINE.
Claim 2
Dependent Claim
167 words
CONTINUOUS STRIP PICKLING APPARATUS COMPRISING A SERIES OF PICKLING TANKS THROUGH WHICH THE STRIP PASSES, A LOUVER, A CONDUIT LEADING FROM THE PICKLING TANK AT THE STRIP ENTRY END TO THE TOP OF THE LOUVER FOR INTRODUCING THE WASTE PICKLE LIQUOR THERETO, A TANK BENEATH THE LOWER COMMUNICATING THEREWITH, NOZZLES AT THE LOWER PART OF THE TANK FOR INTRODUCING COMPRESSED GAS INTO SAID TANK, A PAIR OF TANKS AT THE LOWER END OF SAID FIRST TANK IN COMMUNICATION THEREWITH, A VALVE FOR EACH OF SAID PAIR OF TANKS FOR CONTROLLING THE FLOW OFLIQUID THERETO, A HEAT EXCHANGER, A CONDUIT LEADING FROM THE BOTTOM OF EACH OF THE PAIR OF TANKS TO THE TOP OF THE HEAT EXCHANGER, A COMPRESSOR FOR INTRODUCING GAS TO BE COMPRESSED INTO THE BOTTOM OF SAID HEAT EXCHANGER, A GAS CONDUIT LEADING FROM THE TOP OF SAID HEAT EXCHANGER TO THE SAID NOZZLES, AND A CONDUIT LEADING FROM THE BOTTOM OF THE HEAT EXCHANGER TO THE PICKLING TANK AT THE STRIP EXIT END.
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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) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |