US2905532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing the caking of ammonium sulphate crystals
Assignee: Teck Metals Ltd
•
Filing: 1955-01-28
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Granted: 1959-09-22
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Expires: 1975-01-28
Abstract
No abstract record available.
Inventors
- 👤 Thompson Joshua Beaumont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:35
CPC Classifications
C; C05; C05C; C05C3/00; C05C3/005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
119 words
IN A PROCESS FOR THE PRODUCTION OF AMMONIUM SULPHATE IN WHICH AMMONIUM SULPHITE SOLUTION USED FOR THE ABSORPTION OF SULPHUR DIOXIDE FROM COMBUSTION GAS IS ACIDIFIED WITH SULPHURIC ACID TO FORM AMMONIUM SULPHATE SOLUTION, AMMONIUM SULPHATE SOLUTION IS EVAPORATED TO PRODUCE A SUSPENSION OF AMMONIUM SULPHATE CRYSTALS IN AMMONIUM SULPHATE SOLUTION AND AMMONIUM SULPHATE CRYSTALS ARE SEPARATED FROM THE AMMONIUM SULPHATE SOLUTION, THE IMPROVEMENT WHICH COMPRISES SPRAYING THE AMMONIUM SULPHATE CRYSTALS WITH A SOLUTION WHICH CONTAINS AN ALKYL ARYL SODIUM SULPHONATE IN AMOUNT SUFFICIENT TO PROVIDE FROM ABOUT 0.005% TO ABOUT 0.05% OF AN ALKYL ARYL SODIUM SULPHONATE BY WEIGHT OF THE AMMONIUM SULPHATE CRYSTALS AND THEREAFTER DRYIN THE AMMONIUM SULPHATE CRYSTALS TREATED WITH AN ALKYL ARYL SODIUM SULPHONATE.
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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) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |