Patent EP0024296A1 successfully refreshed from Google Patents.
US3362989A
Expired / Lapsed
US
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Method for fractional sublimation
Assignee: Mobil Oil AS
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Filing: 1964-07-10
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Granted: 1968-01-09
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Expires: 1984-07-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Lawrence E Mcmakin
- 👤 Jr Howard S Bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:37
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; B; B01; B01D; B01D7/00; C07C51/347; C07C51/353; C07C51/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
IN A PROCESS FOR THE PURIFICATION OF VAPORIZABLE, NORMALLY SOLID SUBSTANCES, THE STEPS WHICH COMPRISE INTRODUCING A GASEOUS MIXTURE OF A VAPORIZED SOLID SUBSTANCE WITH MATERIAL SOLIDIFYING AT A LOWER TEMPERATURE THAN SAID SUBSTANCE INTO A CONFINED CONDENSATION ZONE HAVING A BOUNDARY SURFACE MAINTAINED AT TEMPERATURES ABOVE THE DEW POINT OF THE ADJOINING GASEOUS MIXTURE, COOLING SAID GASEOUS MIXTURE BY DIRECT THE HEAT EXCHANGE WITH A COOLING MEDIUM TO FORM CONDENSED PARTICLES OF SAID SUBSTANCE OUT OF CONTACT WITH ANY FIXED SURFACE IN SAID CONDENSATION ZONE, SEPARATING CONDENSED PARTICLES OF SAID SUBSTANCE IN SOLID FORM FROM SAID MATERIAL WHILE IN DIRECT HEAT EXCHANGE WITH AN ADDITIONAL COOLANT IN GASEOUS FORM IN A CONFINED DISENGAGING ZONE HAVING AT LEAST A MAJOR AREA OF BOUNDARY SURFACE MAINTAINED AT TEMPERATURES ABOVE THE DEW POINT OF THE ADJOINING GASEOUS MIXTURE, AND THEREAFTER COLLECTING SAID SOLID PARTICLES IN A CONFINED COLLECTION
Claim 2
Dependent Claim
146 words
IN A PROCESS FOR THE PURIFICATION OF VAPORIZABLE, NORMALLY SOLID SUBSTANCES, THE STEPS WHICH COMPRISE INTRODUCING A GASEOUS MIXTURE OF A VAPORIZED SOLID SUBSTANCE WITH MATERIAL SOLIDIFYING AT A LOWER TEMPERATURE THAN SAID SUBSTANCE INTO A CONFINED CONDENSATION ZONE HAVING A BOUNDARY SURFACE MAINTAINED AT TEMPERATURES ABOVE THE DEW POINT OF THE ADJOINING GASEOUS MIXTURE, COOLING SAID GASEOUS MIXTURE BY DIRECT THE HEAT EXCHANGE WITH A COOLING MEDIUM TO FORM CONDENSED PARTICLES OF SAID SUBSTANCE OUT OF CONTACT WITH ANY FIXED SURFACE IN SAID CONDENSATION ZONE, SEPARATING CONDENSED PARTICLES OF SAID SUBSTANCE IN SOLID FORM FROM SAID MATERIAL WHILE IN DIRECT HEAT EXCHANGE WITH AN ADDITIONAL COOLANT IN GASEOUS FORM IN A CONFINED DISENGAGING ZONE HAVING AT LEAST A MAJOR AREA OF BOUNDARY SURFACE MAINTAINED AT TEMPERATURES ABOVE THE DEW POINT OF THE ADJOINING GASEOUS MIXTURE, AND THEREAFTER COLLECTING SAID SOLID PARTICLES IN A CONFINED COLLECTION
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) | 1971-01-08 | 1971-07-10 | 1972-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-08 | 1975-07-10 | 1976-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-08 | 1979-07-10 | 1980-01-09 | $7700.00 | Window Closed / Lapsed |