Patent US3074277A successfully refreshed from Google Patents.
US3074277A
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Method and apparatus for automatic control of acid concentration in pickling system
Assignee: Inland Steel Co
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Filing: 1958-03-20
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Granted: 1963-01-22
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Expires: 1978-03-20
Abstract
No abstract record available.
Inventors
- 👤 Uno T Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:11
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/26; G01N9/28; B; B01; B01F; B01F35/00; B01F35/80; B01F35/82; C; C23; C23G; C23G1/00; C23G1/02; G01N21/00; G01N21/75; G01N21/77; G01N21/78; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE PICKLING OF IRON OR STEEL BY CONTACT WITH AN AQUEOUS SULFURIC ACID BATH WHERIN ACID IN CONSUMED BY CONVERSION TO FERROUS SULFATE AND WHEREIN MAKE-UP ACID IS ADDED TO THE BATH TO MAINTAIN THE ACID CONCENTRATION OF THE BATH WITHIN PREDETERMINED LIMITS, THE IMPROVEMENT WHICH COMPRISES MEASURING THE SPECIFIC GRAVITY OF THE BATH AND OBTAINING A FIRST PNEUMATIC SIGNAL WHICH IS A MEASURE OF THE SPECIFIC GRAVITY OF THE BATH, PHOTOMETRICALLY MEASURING THE FERROUS SULFATE CONTENT OF THE BATH AND OBTAINING AN ELECTRICIAL SIGNAL WHICH IS A MEASURE OF THE FERROUS SULFATE CONTENT OF THE BATH, CONVERTING SAID ELECTRICAL SIGNAL TO A SECOND PNEUMATIC SIGNAL, AND COMBINING
Claim 2
Dependent Claim
109 words
IN THE PICKLING OF IRON OR STEEL BY CONTACT WITH AN AQUEOUS SULFURIC ACID BATH WHERIN ACID IN CONSUMED BY CONVERSION TO FERROUS SULFATE AND WHEREIN MAKE-UP ACID IS ADDED TO THE BATH TO MAINTAIN THE ACID CONCENTRATION OF THE BATH WITHIN PREDETERMINED LIMITS, THE IMPROVEMENT WHICH COMPRISES MEASURING THE SPECIFIC GRAVITY OF THE BATH AND OBTAINING A FIRST PNEUMATIC SIGNAL WHICH IS A MEASURE OF THE SPECIFIC GRAVITY OF THE BATH, PHOTOMETRICALLY MEASURING THE FERROUS SULFATE CONTENT OF THE BATH AND OBTAINING AN ELECTRICIAL SIGNAL WHICH IS A MEASURE OF THE FERROUS SULFATE CONTENT OF THE BATH, CONVERTING SAID ELECTRICAL SIGNAL TO A SECOND PNEUMATIC SIGNAL, AND COMBINING
References Cited (Backward Citations)
US1576001A
Cited
US2063140A
Cited
US2161453A
Cited
US2302327A
Cited
US2586169A
Cited
US2577548A
Cited
US2579220A
Cited
US2772779A
Cited
US2927871A
Cited
US2898763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |