US3077036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature responsive freeze drying method and apparatus
Assignee: Leybold Hochvakuum Anlagen GmbH
•
Filing: 1960-01-08
•
Granted: 1963-02-12
•
Expires: 1980-01-08
Abstract
No abstract record available.
Inventors
- 👤 Neumann Karlheinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:50
CPC Classifications
C; C12; C12N; C12N1/00; C12N1/04; A; A23; A23B; A23B2/00; A23B2/90; A23B2/92; F; F26; F26B; F26B5/00; F26B5/04; F26B5/06; F25; F25D; F25D2700/00; F25D2700/16; F25D31/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN A METHOD OF OPERATING A FREEZE DRYING INSTALLATION IN WHICH WATER IS SUBLIMATED IN A VACUUM FROM THE MATERIAL TO BE DRIED TO AN ICE CONDENSER WHILE THE MATERIAL IS BEING HEATED BY A HEATING DEVICE, THE STEP OF CONTROLLING THE PRESSURE IN THE VACUUM DRYING CHAMBER IN RESPONSE TO THE TEMPERATURE OF THE MATERIAL BEING DRIED FOR MAINTAINING EACH BATCH AT SUBSTANTIALLY A PREDETERMINED OPTIMUM TEMPERATURE WHICH PREDETERMINED OPTIMUM TEMPERATURE IS SO SELECTED THAT WHEN THE MATERIAL IS KEPT AT SUCH TEMPERATURE, THE HEAT FLOW TO THE MATERIAL CORRESPONDS TO THE COLD DUE TO EVAPORATION WHICH IS PRODUCED BY THE SUBLIMATION, WHICH COLD RESULTS AT THE MAXIMUM PERMISSIBLE TEMPERATURE OF THE FROZEN MATERIAL, SAID PRESSURE BEING DECREASED WHEN THE TEMPERATURE OF THE MATERIAL RISES AND INCREASED WHEN THE TEMPERATURE OF THE MATERIAL FALLS, WHEREBY THE TEMPERATURE OF THE MATERIAL BEING DRIED IS, IN TURN, KEPT AT THE DESIRED OPTIMUM LEVEL BY SAID STEP OF CONTROLLING THE PRESSURE IN THE VACUUM DRYING CHAMBER.
Claim 2
Dependent Claim
164 words
IN A METHOD OF OPERATING A FREEZE DRYING INSTALLATION IN WHICH WATER IS SUBLIMATED IN A VACUUM FROM THE MATERIAL TO BE DRIED TO AN ICE CONDENSER WHILE THE MATERIAL IS BEING HEATED BY A HEATING DEVICE, THE STEP OF CONTROLLING THE PRESSURE IN THE VACUUM DRYING CHAMBER IN RESPONSE TO THE TEMPERATURE OF THE MATERIAL BEING DRIED FOR MAINTAINING EACH BATCH AT SUBSTANTIALLY A PREDETERMINED OPTIMUM TEMPERATURE WHICH PREDETERMINED OPTIMUM TEMPERATURE IS SO SELECTED THAT WHEN THE MATERIAL IS KEPT AT SUCH TEMPERATURE, THE HEAT FLOW TO THE MATERIAL CORRESPONDS TO THE COLD DUE TO EVAPORATION WHICH IS PRODUCED BY THE SUBLIMATION, WHICH COLD RESULTS AT THE MAXIMUM PERMISSIBLE TEMPERATURE OF THE FROZEN MATERIAL, SAID PRESSURE BEING DECREASED WHEN THE TEMPERATURE OF THE MATERIAL RISES AND INCREASED WHEN THE TEMPERATURE OF THE MATERIAL FALLS, WHEREBY THE TEMPERATURE OF THE MATERIAL BEING DRIED IS, IN TURN, KEPT AT THE DESIRED OPTIMUM LEVEL BY SAID STEP OF CONTROLLING THE PRESSURE IN THE VACUUM DRYING CHAMBER.
References Cited (Backward Citations)
US942150A
Cited
US2199815A
Cited
US2172916A
Cited
US2268769A
Cited
US2343467A
Cited
US2432587A
Cited
US2438120A
Cited
US2442114A
Cited
US2441730A
Cited
US2462279A
Cited
US2564475A
Cited
US2731734A
Cited
US2994132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-11 | 1966-08-13 | 1967-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-11 | 1970-08-13 | 1971-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-11 | 1974-08-13 | 1975-02-12 | $7700.00 | Window Closed / Lapsed |