Patent US3379028A successfully refreshed from Google Patents.
US3379028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melting a crystalline fraction in a solvent presence
Assignee: Phillips Petroleum Co
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Filing: 1966-04-04
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Granted: 1968-04-23
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Expires: 1986-04-04
Abstract
No abstract record available.
Inventors
- 👤 Glenn H Dale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:57
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; B01D11/0261; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004; B01D9/0059; B01D9/0063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS FOR PURIFYING A HIGH MELTING POINT OR SUBLIMABLE OR HEAT DECOMPOSABE MATERIAL COMPRISING PASSING SAID MATERIAL TO A CHILLER TO FORM A CRYSTAL SLURRY, PASSING SAID CRYSTAL SLURRY TO A PURIFICATION ZONE WHERE NON-CRYSTALLIZED IMPURITIES ARE REMOVED, PASSING CRYSTALS THROUGH A PURIFICATION ZONE, PASSING PURIFIED CRYSTALS TO A MELTING ZONE IN WHICH CRYSTALS ARE MELTED AT LEAST IN PART BY A HEATER IN THE PRESENCE OF SOLVENT, PASSING MELT AND SOLVENT COUNTERCURRENT TO CRYSTAL FLOW TO SAID PURIFICATION ZONE, PASSING SOLVENT TO SAID MELTING ZONE, REMOVING SOLVENT AND PURIFIED MATERIAL FROM SAID MELTING ZONE, CONTROLLING THE SOLVENT FEED TO SAID MELTING ZONE RESPONSIVE TO A CONDITION SELECTED FROM A GROUP CONSISTING OF TEMPERATURE IN SAID MELTING ZONE AND COMPOSITION MEASUREMENT OF A MIXTURE OF SOLVENT AND PURIFIED MATERIAL REMOVED FROM THE MELT ZONE.
Claim 2
Dependent Claim
135 words
A PROCESS FOR PURIFYING A HIGH MELTING POINT OR SUBLIMABLE OR HEAT DECOMPOSABE MATERIAL COMPRISING PASSING SAID MATERIAL TO A CHILLER TO FORM A CRYSTAL SLURRY, PASSING SAID CRYSTAL SLURRY TO A PURIFICATION ZONE WHERE NON-CRYSTALLIZED IMPURITIES ARE REMOVED, PASSING CRYSTALS THROUGH A PURIFICATION ZONE, PASSING PURIFIED CRYSTALS TO A MELTING ZONE IN WHICH CRYSTALS ARE MELTED AT LEAST IN PART BY A HEATER IN THE PRESENCE OF SOLVENT, PASSING MELT AND SOLVENT COUNTERCURRENT TO CRYSTAL FLOW TO SAID PURIFICATION ZONE, PASSING SOLVENT TO SAID MELTING ZONE, REMOVING SOLVENT AND PURIFIED MATERIAL FROM SAID MELTING ZONE, CONTROLLING THE SOLVENT FEED TO SAID MELTING ZONE RESPONSIVE TO A CONDITION SELECTED FROM A GROUP CONSISTING OF TEMPERATURE IN SAID MELTING ZONE AND COMPOSITION MEASUREMENT OF A MIXTURE OF SOLVENT AND PURIFIED MATERIAL REMOVED FROM THE MELT ZONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |