US3263335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for freeze drying utilizing dry gas
Assignee: United Fruit Co
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Filing: 1963-10-31
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Granted: 1966-08-02
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Expires: 1983-10-31
Abstract
No abstract record available.
Inventors
- 👤 Kan Billy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:19
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/90; A23B2/92; F; F26; F26B; F26B5/00; F26B5/04; F26B5/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
141 words
AN IMPROVED FREEZE DRYING METHOD FOR A HEATERCONDENSER-DRYING SHELF SYSTEM, COMPRISING THE STEPS OF EVACUATING THE SYSTEM, ISOLATING THE SYSTEM, AND PARTIALLY BACKFILLING WITH A DRY, NONCONDENSIBLE, INERT GAS, MAINTAINING THE SYSTEM ISOLATED FROM EVACUATING MEANS FOR A CONTINUOUS PERIOD AT LEAST THROUGHOUT HALF THE DRYING CYCLE TIME SO THAT THE DRY GAS REMAINS IN THE SYSTEM, MAINTAINING A FLOW OF WATER VAPOR FROM THE FOODPRODUCT TO THE CONDENSER AND DIFFUSING DRY GAS INTO THE CELLULAR DRY OUTER LAYERS OF FOOD PRODUCT SO THAT A CERTAIN PARTAIN PRESSURE OF DRY GAS IS CONTINUOUSLY MAINTAINED IN THE LAYERS THROUGH SAID PERIOD OF ISOLATION, THE SAID PARTIAL PRESSURE OF DRY GAS BEING AT LEAST EQUAL TO THE PARTIAL PRESSURE OF WATER VAPOR IN SAID SHALF AREA AND LESS THAN 12 TORR, AS MEASURED IN THE SHELF AREA MOST REMOTE FROM THE CONDENSER INLET.
References Cited (Backward Citations)
US1458403A
Cited
US2333850A
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US2435503A
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US2564475A
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US2751687A
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US3010216A
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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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |