US2556185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anhydrous caustic soda process
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1947-03-21
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Granted: 1951-06-12
•
Expires: 1967-03-21
Abstract
No abstract record available.
Inventors
- 👤 Joscelyne Francis Mandeville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:36
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/42; Y; Y10; Y10S; Y10S159/00; Y10S159/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR THE MANUFACTURE OF SOLID SUBSTANTIALLY ANHYDROUS CAUSTIC SODA FROM AN AQUEOUS SOLUTION THEREOF WHICH COMPRISES HEATING AN AQUEOUS CAUSTIC SODA SOLUTION OF BETWEEN 80% AND 95% CAUSTIC SODA CONTENT TO A TEMPERATURE BETWEEN 200* C. AND 300* C., THEN PROVIDING A LARGE SURFACE AREA OF THE HEATED SOLUTION, SUBJECTING THE SOLUTION TO A PARTIAL WATER VAPOUR PRESSURE OF LESS THAN 600 MM. OF MERCURY, AND SUBSTANTIALLY ADIABATICALLY ALLOWING THE SOLUTION TO YIELD SOLID ANHYDROUS CAUSTIC SODA.
Claim 2
Dependent Claim
79 words
A PROCESS FOR THE MANUFACTURE OF SOLID SUBSTANTIALLY ANHYDROUS CAUSTIC SODA FROM AN AQUEOUS SOLUTION THEREOF WHICH COMPRISES HEATING AN AQUEOUS CAUSTIC SODA SOLUTION OF BETWEEN 80% AND 95% CAUSTIC SODA CONTENT TO A TEMPERATURE BETWEEN 200* C. AND 300* C., THEN PROVIDING A LARGE SURFACE AREA OF THE HEATED SOLUTION, SUBJECTING THE SOLUTION TO A PARTIAL WATER VAPOUR PRESSURE OF LESS THAN 600 MM. OF MERCURY, AND SUBSTANTIALLY ADIABATICALLY ALLOWING THE SOLUTION TO YIELD SOLID ANHYDROUS CAUSTIC SODA.
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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) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |