US2853796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for dehydration of heat sensitive substances
Assignee: WALLACE B TRUSLOW
•
Filing: 1954-10-29
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Granted: 1958-09-30
•
Expires: 1974-10-29
Abstract
No abstract record available.
Inventors
- 👤 George R Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:47
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/04; F26B5/06; Y; Y10; Y10S; Y10S159/00; Y10S159/05; Y10S159/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE METHOD OF DEHYDRATING A HEAT SENSITIVE PRODUCT BY SUBLIMATION WHICH COMPRISES QUICKLY FREEZING SAID PRODUCT TO A TEMPERATURE OF ABOUT -20*C. WITH THE FROZEN PRODUCT IN A RELATIVELY THIN SHEET, PLACING EACH OF THE OPPOSED SURFACES OF SAID SHEET IN ADJACENT RELATIONSHIP TO A CONDENSER SURFACE HAVING A TEMPERATURE OF ABOUT -60*C., PRODUCING A SUB-ATMOSPHERIC PRESSURE AROUND SAID SHEET AND CONDENSER, SUBSTANTIALLY MAINTAINING SAID SHEET AND CONDENSER SURFACES AT THEIR RESPECTIVE TEMPERATURES WHEREBY THE VAPOR PRESSURE DIFFERENTIAL THEREBETWEEN RESULTS IN MIGRATION OF WATER MOLECULES TO THE CONDENSER FROM THE SHEET SURFACES ALONG AN UNRESTRICTED MEAN FREE PATH OF MINIMUM LENGTH, AND REMOVING CONDENSED ICE FROM SAID CONDENSER SURFACE AND FROM THE INFLUENCE OF SAID SUB-ATMOSPHERIC PRESSURE WTHOUT INCREASING THE LATTER.
Claim 2
Independent Claim
121 words
THE METHOD OF DEHYDRATING A HEAT SENSITIVE PRODUCT BY SUBLIMATION WHICH COMPRISES QUICKLY FREEZING SAID PRODUCT TO A TEMPERATURE OF ABOUT -20*C. WITH THE FROZEN PRODUCT IN A RELATIVELY THIN SHEET, PLACING EACH OF THE OPPOSED SURFACES OF SAID SHEET IN ADJACENT RELATIONSHIP TO A CONDENSER SURFACE HAVING A TEMPERATURE OF ABOUT -60*C., PRODUCING A SUB-ATMOSPHERIC PRESSURE AROUND SAID SHEET AND CONDENSER, SUBSTANTIALLY MAINTAINING SAID SHEET AND CONDENSER SURFACES AT THEIR RESPECTIVE TEMPERATURES WHEREBY THE VAPOR PRESSURE DIFFERENTIAL THEREBETWEEN RESULTS IN MIGRATION OF WATER MOLECULES TO THE CONDENSER FROM THE SHEET SURFACES ALONG AN UNRESTRICTED MEAN FREE PATH OF MINIMUM LENGTH, AND REMOVING CONDENSED ICE FROM SAID CONDENSER SURFACE AND FROM THE INFLUENCE OF SAID SUB-ATMOSPHERIC PRESSURE WTHOUT INCREASING THE LATTER.
References Cited (Backward Citations)
US1970956A
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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) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |