US2651922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallization process and apparatus
Assignee: Phillips Petroleum Co
•
Filing: 1949-09-02
•
Granted: 1953-09-15
•
Expires: 1969-09-02
Abstract
No abstract record available.
Inventors
- 👤 Benton L Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:31
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/14; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
THE METHOD OF RESOLVING A MIXTURE OF COMPOUNDS INTO A HIGHER-MELTING FRACTION AND A LOWER-MELTING FRACTION WHICH COMPRISES FREEZING A PORTION OF THE MIXTURE, REMOVING THE FROZEN PORTION FROM CONTACT WITH THE LIQUID, MECHANICALLY EXPRESSING THE OCCLUDED MOTHER LIQUOR FROM THE SOLID, RETURNING THE EXPRESSED LIQUID AS REFLUX OVER THE REMOVED FROZEN PORTION TO THE MOTHER LIQUOR, RE-MELTING THE SOLID OUT OF CONTACT WITH ITS MOTHER LIQUOR TO FORM A NEW MOTHER LIQUOR AND REPEATING THE STEP DESCRIBED
Claim 2
Independent Claim
78 words
THE METHOD OF RESOLVING A MIXTURE OF COMPOUNDS INTO A HIGHER-MELTING FRACTION AND A LOWER-MELTING FRACTION WHICH COMPRISES FREEZING A PORTION OF THE MIXTURE, REMOVING THE FROZEN PORTION FROM CONTACT WITH THE LIQUID, MECHANICALLY EXPRESSING THE OCCLUDED MOTHER LIQUOR FROM THE SOLID, RETURNING THE EXPRESSED LIQUID AS REFLUX OVER THE REMOVED FROZEN PORTION TO THE MOTHER LIQUOR, RE-MELTING THE SOLID OUT OF CONTACT WITH ITS MOTHER LIQUOR TO FORM A NEW MOTHER LIQUOR AND REPEATING THE STEP DESCRIBED
References Cited (Backward Citations)
US306543A
Cited
US1560473A
Cited
US1906534A
Cited
US2131333A
Cited
US2308541A
Cited
US2435792A
Cited
US2470116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |