US3297413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing mgso4 3h2o crystals
Assignee: Dow Chemical Co
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Filing: 1964-03-20
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Granted: 1967-01-10
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Expires: 1984-03-20
Abstract
No abstract record available.
Inventors
- 👤 Wallis R Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:01
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A MEHTOD FOR PREPARING MAGNESIUM SULFATE TRIHYDRATE CRYSTALS FROM MAGNESIUM SULFATE SOLUTIONS WHICH COMPRISES: (A) CONCENTRATING BY HEATING AN UNSATURATED AQUEOUS SOLUTION OF MAGNESIUM SULFATE TO A BOILING TEMPERATURE, AT ATMOSPHERIC PRESSURE, WITHIN THE RANGE OF FROM ABOUT 106* TO ABOUT 11*C., (B) MAINTAINING THE SAID TEMPERATURE RANGE WHILE PRECIPITATING MAGNESIUM SULFATE TRIHYDRATE CRYSTALS IN THE REACTION MASS, AND (C) SEPARATING AND RECOVERING SAIS CRYSTALS OF MAGNESIUM SULFATE TRIHYDRATE FROM THE AQUEOUS SOLUTION.
Claim 2
Dependent Claim
73 words
A MEHTOD FOR PREPARING MAGNESIUM SULFATE TRIHYDRATE CRYSTALS FROM MAGNESIUM SULFATE SOLUTIONS WHICH COMPRISES: (A) CONCENTRATING BY HEATING AN UNSATURATED AQUEOUS SOLUTION OF MAGNESIUM SULFATE TO A BOILING TEMPERATURE, AT ATMOSPHERIC PRESSURE, WITHIN THE RANGE OF FROM ABOUT 106* TO ABOUT 11*C., (B) MAINTAINING THE SAID TEMPERATURE RANGE WHILE PRECIPITATING MAGNESIUM SULFATE TRIHYDRATE CRYSTALS IN THE REACTION MASS, AND (C) SEPARATING AND RECOVERING SAIS CRYSTALS OF MAGNESIUM SULFATE TRIHYDRATE FROM THE AQUEOUS SOLUTION.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |