US3597164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the purification of crystallizable organic compounds
Assignee: BEFS ENGINEERING A CORP OF FRANCE Ste
•
Filing: 1968-09-03
•
Granted: 1971-08-03
•
Expires: 1988-09-03
Abstract
Abstract A PROCESS AND METHOD FOR PURIFYING A CRYSTALLIZABLE ORGANIC COMPOUND IN THE LIQUID STATE IN A VESSEL. THE PROCESS COMPRISES INTRODUCING THE COMPOUND IN AT LEAST ONE VESSEL, SOLIDIFYING SAID COMPOUND BY COOLING AND THEN HEATING IT SLOWLY SO AS TO MELT THE IMPURITIES WHICH DRAIN FROM THE REMAINING PRODUCT, THE LATTER BEING PROGREEIVELY PURIFIED AND COLLECTED WHEN IT REACHED THE DESIRED PURITY. THE FEATURE OF THE INVENTION IS THAT THE COOLING AND HEATING OF SAID COMPOUND TO BE PURIFIED ARE CARRIED OUT BY CAUSING A HEAT EXCHANGE FLUID TO FLOW ON THE OUTER WALL OF SAID VESSEL CONTAINING SAID COMPOUND, SAID VESSEL HAVING FOR THIS PURPOSE A LARGE HEAT TRANSFER SURFACE.
Inventors
- 👤 Claude Ab-Der-Halden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:39
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004; B01D9/0072
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |