Patent US2944878A successfully refreshed from Google Patents.
US2944878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of substances by vaporization
Assignee: Pechiney SA
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Filing: 1957-03-22
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Granted: 1960-07-12
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Expires: 1977-03-22
Abstract
No abstract record available.
Inventors
- 👤 Jacque Leon
- 👤 Dumez Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:22
CPC Classifications
B; B01; B01D; B01D7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
PROCESS OF SEPARATING A SOLID MIXTURE INTO SOLID COMPONENTS OF DIFFERENT VOLATILITIES, COMPRISING THE STEPS: SUBJECTING THE MIXTURE TO VAPORIZING CONDITIONS IN A VAPORIZING ZONE, ESTABLISHING IN A FRACTIONATING ZONE CONNECTED TO SAID VAPORIZING ZONE A TEMPERATURE GRADIENT WHEREBY THE TEMPERATURE IN SAID FRACIONATING ZONE PROGRESSIVELY DECREASES FROM APPROXIMATELY THE TEMPERATURE IN SAID VAPORIZING ZONE TO APPROXIMATELY THE VAPORIZATION TEMPERATURE OF THE MOST VOLATILE COMPONENT TO BE RECOVERED, PASSING THE VAPORS FORM THE VAPORIZING ZONE THROUGH THE FRACTIONATING ZONE, WHEREBY THE VAPORS OF AT LEAST ONE COMPONENT ARE CONDENSED THEREIN IN SOLID STATE, THEREAFTER DISPLACING THE TEMPERATURE GRADIENT IN THE FRACTIONATING ZONE RELATIVE TO THE VAPORIZING ZONE, WHEREBY AT LEAST ONE CONDENSED COMPONENT IS REVAPORIZED AND
Claim 2
Dependent Claim
116 words
PROCESS OF SEPARATING A SOLID MIXTURE INTO SOLID COMPONENTS OF DIFFERENT VOLATILITIES, COMPRISING THE STEPS: SUBJECTING THE MIXTURE TO VAPORIZING CONDITIONS IN A VAPORIZING ZONE, ESTABLISHING IN A FRACTIONATING ZONE CONNECTED TO SAID VAPORIZING ZONE A TEMPERATURE GRADIENT WHEREBY THE TEMPERATURE IN SAID FRACIONATING ZONE PROGRESSIVELY DECREASES FROM APPROXIMATELY THE TEMPERATURE IN SAID VAPORIZING ZONE TO APPROXIMATELY THE VAPORIZATION TEMPERATURE OF THE MOST VOLATILE COMPONENT TO BE RECOVERED, PASSING THE VAPORS FORM THE VAPORIZING ZONE THROUGH THE FRACTIONATING ZONE, WHEREBY THE VAPORS OF AT LEAST ONE COMPONENT ARE CONDENSED THEREIN IN SOLID STATE, THEREAFTER DISPLACING THE TEMPERATURE GRADIENT IN THE FRACTIONATING ZONE RELATIVE TO THE VAPORIZING ZONE, WHEREBY AT LEAST ONE CONDENSED COMPONENT IS REVAPORIZED AND
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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) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |