Patent US1589696A successfully refreshed from Google Patents.
Patent US2863724A successfully refreshed from Google Patents.
US2863724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying sulfuric acid
Assignee: MW Kellogg Co
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Filing: 1955-07-08
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Granted: 1958-12-09
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Expires: 1975-07-08
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Skelly
- 👤 Samuel R Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:09
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
IN A PROCESS FOR PURIFYING SULFURIC ACID CONTAMINATED WITH AT LEAST ONE IMPURITY SELECTED FROM POLAR AND NONPOLAR IMPURITIES WHEREIN A LOW VISCOSITY OF ORGANIC LIQUID WHICH IS CHEMICALLY INERT AND IMMISCIBLE WITH SULFURIC ACID IS PASSED TO A CRYSTALLIZATION ZONE TO FORM A LIQUID ACID THEREIN, CONTAMINATED ACID IS PASSED TO THE CRYSTALLIZATION ZONE, SAID CONTAMINATED ACID IS DISPERSED INTO THE LIQUID BODY OF THE CRYSTALLIZATION ZONE WHICH IS MAINTAINED AT A TEMPERATURE SUFFICIENT TO CRYSTALLIZE SULFURIC ACID, AND A SLURRY OF ACID CRYSTALS AND LIQUID IS WITHDRAWN FROM THE CRYSTALLIZATION ZONE, THE IMPROVEMENTS WHICH COMPRISE RECYCLING A PORTION OF SAID SLURRY TO THE CRYSTALLIZATION ZONE, SEPARATING ACID CRYSTALS FROM THE REMAINING PORTION OF SAID SLURRY, AND MELTING SAID SEPARATED CRYSTALS TO PRODUCE AN ACID OF IMPROVED PURITY.
Claim 2
Dependent Claim
129 words
IN A PROCESS FOR PURIFYING SULFURIC ACID CONTAMINATED WITH AT LEAST ONE IMPURITY SELECTED FROM POLAR AND NONPOLAR IMPURITIES WHEREIN A LOW VISCOSITY OF ORGANIC LIQUID WHICH IS CHEMICALLY INERT AND IMMISCIBLE WITH SULFURIC ACID IS PASSED TO A CRYSTALLIZATION ZONE TO FORM A LIQUID ACID THEREIN, CONTAMINATED ACID IS PASSED TO THE CRYSTALLIZATION ZONE, SAID CONTAMINATED ACID IS DISPERSED INTO THE LIQUID BODY OF THE CRYSTALLIZATION ZONE WHICH IS MAINTAINED AT A TEMPERATURE SUFFICIENT TO CRYSTALLIZE SULFURIC ACID, AND A SLURRY OF ACID CRYSTALS AND LIQUID IS WITHDRAWN FROM THE CRYSTALLIZATION ZONE, THE IMPROVEMENTS WHICH COMPRISE RECYCLING A PORTION OF SAID SLURRY TO THE CRYSTALLIZATION ZONE, SEPARATING ACID CRYSTALS FROM THE REMAINING PORTION OF SAID SLURRY, AND MELTING SAID SEPARATED CRYSTALS TO PRODUCE AN ACID OF IMPROVED PURITY.
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |