US3259991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Freeze drying method and apparatus
Assignee: Abbott Laboratories
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Filing: 1965-01-07
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Granted: 1966-07-12
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Expires: 1985-01-07
Abstract
No abstract record available.
Inventors
- 👤 Jr George M Illich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:03
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/04; F26B5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A METHOD OF DRYING A TEMPERATURE SENSITIVE MATERIAL IN A VACUUM CHAMBER HAVING IN COMMUNICATION THEREWITH A THERMOCOUPLE TYPE VACUUM GAUGE AND AN IONIZATION TYPE VACUUM GAUGE, COMPRISING THE STEPS OF: FREEZING THE MATERIAL; PLACING THE FROZEN MATERIAL IN THE VACUUM CHAMBER; APPLYING HEAT AND VACUUM TO THE VACUUM CHAMBER TO REMOVE MOISTURE FROM THE MATERIAL BEING DRIED; CALIBRATING THE THERMOCOUPLE TYPE VACUUM GAUGE AND THE IONIZATION TYPE VACUUM GAUGE FOR A VACUUM ATMOSPHERE OF AIR; RECORDING THE THERMOCOUPLE TYPE VACUUM GAUGE READING WHILE CONDUCTING THE DRYING OPERATION; SIMULTANEOUSLY RECORDING THE IONIZATION TYPE VACUUM GAUGE READING; AND APPLYING ADDITIONAL HEAT AND VACUUM TO THE VACUUM CHAMBER WHEN THE THERMOCOUPLE TYPE VACUUM GAUGE READING AND THE IONIZATION TYPE VACUUM GAUGE READING ARE ESSENTIALLY THE SAME, AT WHICH TIME THE MAJOR PORTION OF THE MOISTURE HAS BEEN REMOVED FROM THE MATERIAL BEING DRIED AND THE VACUUM CHAMBER ATMOSPHERE IS SUBSTANTIALLY ALL AIR.
Claim 2
Independent Claim
150 words
A METHOD OF DRYING A TEMPERATURE SENSITIVE MATERIAL IN A VACUUM CHAMBER HAVING IN COMMUNICATION THEREWITH A THERMOCOUPLE TYPE VACUUM GAUGE AND AN IONIZATION TYPE VACUUM GAUGE, COMPRISING THE STEPS OF: FREEZING THE MATERIAL; PLACING THE FROZEN MATERIAL IN THE VACUUM CHAMBER; APPLYING HEAT AND VACUUM TO THE VACUUM CHAMBER TO REMOVE MOISTURE FROM THE MATERIAL BEING DRIED; CALIBRATING THE THERMOCOUPLE TYPE VACUUM GAUGE AND THE IONIZATION TYPE VACUUM GAUGE FOR A VACUUM ATMOSPHERE OF AIR; RECORDING THE THERMOCOUPLE TYPE VACUUM GAUGE READING WHILE CONDUCTING THE DRYING OPERATION; SIMULTANEOUSLY RECORDING THE IONIZATION TYPE VACUUM GAUGE READING; AND APPLYING ADDITIONAL HEAT AND VACUUM TO THE VACUUM CHAMBER WHEN THE THERMOCOUPLE TYPE VACUUM GAUGE READING AND THE IONIZATION TYPE VACUUM GAUGE READING ARE ESSENTIALLY THE SAME, AT WHICH TIME THE MAJOR PORTION OF THE MOISTURE HAS BEEN REMOVED FROM THE MATERIAL BEING DRIED AND THE VACUUM CHAMBER ATMOSPHERE IS SUBSTANTIALLY ALL AIR.
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) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |