Patent US2741250A successfully refreshed from Google Patents.
US2741250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for pickling metal
Assignee: Individual
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Filing: 1953-01-07
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Granted: 1956-04-10
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Expires: 1973-01-07
Abstract
No abstract record available.
Inventors
- 👤 Cornelius A Rauh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:58
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN A CONTINUOUS PROCESS OF PICKLING STEEL AND THE LIKE WITH A HEATED AQUEOUS SULFURIC ACID PICKLING SOLUTION, THE CYCLIC STEPS OF PASSING A STREAM OF RECONDITIONED PICKLING SOLUTION PRODUCED IN A SUBSEQUENT STEP AT DESIRED TEMPERATURE AND ACID CONTENT CONTINUOUSLY IN CONTACT WITH THE METAL BEING PICKLED, THEREBY FORMING A USED PICKLING SOLUTION; CONTINUOUSLY CONCENTRATING A FIRST PORTION OF SAID USED SOLUTION BY DIRECT CONTACT FLAME HEATING TO EFFECT CRYSTALLIZATION OF A FERROUS SULFATE SALT THEREIN; SEPARATING THE RESULTANT CONCENTRATED SOLUTION
Claim 2
Dependent Claim
82 words
IN A CONTINUOUS PROCESS OF PICKLING STEEL AND THE LIKE WITH A HEATED AQUEOUS SULFURIC ACID PICKLING SOLUTION, THE CYCLIC STEPS OF PASSING A STREAM OF RECONDITIONED PICKLING SOLUTION PRODUCED IN A SUBSEQUENT STEP AT DESIRED TEMPERATURE AND ACID CONTENT CONTINUOUSLY IN CONTACT WITH THE METAL BEING PICKLED, THEREBY FORMING A USED PICKLING SOLUTION; CONTINUOUSLY CONCENTRATING A FIRST PORTION OF SAID USED SOLUTION BY DIRECT CONTACT FLAME HEATING TO EFFECT CRYSTALLIZATION OF A FERROUS SULFATE SALT THEREIN; SEPARATING THE RESULTANT CONCENTRATED SOLUTION
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) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |