Patent US3910685A successfully refreshed from Google Patents.
Patent US2898271A successfully refreshed from Google Patents.
US2898271A
Expired / Lapsed
US
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Crystal purification apparatus
Assignee: Phillips Petroleum Co
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Filing: 1954-07-06
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Granted: 1959-08-04
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Expires: 1974-07-06
Abstract
No abstract record available.
Inventors
- 👤 Robert A Findlay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:08
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
AN APPARATUS FOR SEPARATING AND PURIFYING LIQUID MIXTURES BY CRYSTALLIZATION WHEREINTHE CRYSTALLIZING MATERIAL FORMS WAX-LIKE CRYSTALS SAID APPARATUS COMPRISING IN COMBINATION AT LEAST ONE CRYSTALLIZATION CHAMBER, EACH SAID CHAMBER HAVING AN INLET, MEANS FOR SCRAPING THE INTERNAL WALLS OF EACH SAID CHAMBER AND MEANS FOR COOLING EACH SAID CHAMBER; A PLURALITY OF CYLINDRICAL FILTER CHAMBERS HAVING FILTER MEANS IN SAID CHAMBER WALLS FOR WITHDRAWING LIQUID TO A COMMON COLLECTION ZONE, EACH OF LAST SAID CHAMBERS HAVING A ROTATABLE SCREW JOURNALED THEREIN, SAID SCREW HAVING A SMOOTHLY DECREASING PITCH FROM INLET TO OUTLET; MEANS FOR PASSING MATERIAL FROM SAID CRYSTALLIZATION CHAMBER TO SAID PLURALITY OF FILTERING CHAMBERS; A COMMON HOUSING AROUND SAID PLURALITY OF FILETERING CHAMBERS; MEANS FOR WITHDRAWING LIQUID FROM SAID COMMON HOUSING: A PLURALITY OF PURIFICATION CHAMBERS EACH BEING IN FREE COMMUNICATION WITH THE OUTLET OF AND ASSOCIATED WITH A FILTERING CHAMBER, THE WALLS OF SAID PURIFICATION CHAMBERS HAVING FILTERING MEANS FOR WITHDRAWING LIQUID AND EACH SAID PRUIFICATION CHAMBER HAVING STIRRING
Claim 2
Independent Claim
162 words
AN APPARATUS FOR SEPARATING AND PURIFYING LIQUID MIXTURES BY CRYSTALLIZATION WHEREINTHE CRYSTALLIZING MATERIAL FORMS WAX-LIKE CRYSTALS SAID APPARATUS COMPRISING IN COMBINATION AT LEAST ONE CRYSTALLIZATION CHAMBER, EACH SAID CHAMBER HAVING AN INLET, MEANS FOR SCRAPING THE INTERNAL WALLS OF EACH SAID CHAMBER AND MEANS FOR COOLING EACH SAID CHAMBER; A PLURALITY OF CYLINDRICAL FILTER CHAMBERS HAVING FILTER MEANS IN SAID CHAMBER WALLS FOR WITHDRAWING LIQUID TO A COMMON COLLECTION ZONE, EACH OF LAST SAID CHAMBERS HAVING A ROTATABLE SCREW JOURNALED THEREIN, SAID SCREW HAVING A SMOOTHLY DECREASING PITCH FROM INLET TO OUTLET; MEANS FOR PASSING MATERIAL FROM SAID CRYSTALLIZATION CHAMBER TO SAID PLURALITY OF FILTERING CHAMBERS; A COMMON HOUSING AROUND SAID PLURALITY OF FILETERING CHAMBERS; MEANS FOR WITHDRAWING LIQUID FROM SAID COMMON HOUSING: A PLURALITY OF PURIFICATION CHAMBERS EACH BEING IN FREE COMMUNICATION WITH THE OUTLET OF AND ASSOCIATED WITH A FILTERING CHAMBER, THE WALLS OF SAID PURIFICATION CHAMBERS HAVING FILTERING MEANS FOR WITHDRAWING LIQUID AND EACH SAID PRUIFICATION CHAMBER HAVING STIRRING
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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) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |