Patent US2662812A successfully refreshed from Google Patents.
US2662812A
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Regeneration of spent pickle liquor and recovery of ferrous sulfate monohydrate
Assignee: Beazer East Inc
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Filing: 1949-11-03
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Granted: 1953-12-15
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Expires: 1969-11-03
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:27
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/36; C01; C01G; C01G49/00; C01G49/14; Y; Y10; Y10S; Y10S159/00; Y10S159/25; Y10S423/00; Y10S423/01; Y10S423/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
86 words
THE METHOD OF SEPARATING INTO FERROUS SULPHATE AND SULPHURIC ACID, PICKLE LIQUOR THAT HAS BEEN PRODUCED BY TREATING FERROUS METAL WITH SULPHURIC ACID, SAID METHOD COMPRISING IN COMBINATION THE STEPS OF EVAPORATING SAID PICKLE LIQUOR UNTIL THE SAME IS SATURATED WITH RESPECT TO SAID FERROUS SULPHATE BUT WITHOUT ANY SUBSTANTIAL CRYSTALLIZATION OF FERROUS SULPHATE THEREFROM, THEREAFTER ADDING SUFFICIENT CONCENTRATED SULPHURIC ACID TO SAID EVAPORATED LIQUOR TO PRECIPITATE THE IRON IN THE SOLUTION AS FERROUS SULPHATE MONOHYDRATE AND FINALLY SEPARATING THE SO-PRECIPITATED MONOHYDRATE FROM SAID ACID LIQUOR.
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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) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |