US2731731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of drying heat sensitive biologically active substances
Assignee: Bayer Corp
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Filing: 1952-03-07
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Granted: 1956-01-24
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Expires: 1972-03-07
Abstract
No abstract record available.
Inventors
- 👤 Jr John H Hink
- 👤 Frederick F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:28
CPC Classifications
F; F26; F26B; F26B5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE PROCESS OF DRYING A WET, HEAT SENSITIVE, BIOLOGICALLY ACTIVE SUBSTANCE CONTAINING AN AQUEOUS PHASE COMPRISING: FREEZING SAID SUBSTANCE, CONTINUOUSLY FLOWING A BODY OF COLD, HIGHLY VOLATILE, WATER-MISCIBLE, ORGANIC SOLVENT INERT WITH RESPECT TO SAID FROZEN SUBSTANCE IN CLOSED CIRCUIT THROUGH A BODY OF FROZEN FRAGMENTS OF SAID SUBSTANCE, THROUGH A BODY OF A REGENERABLE CHEMICAL DESICCANT AND THROUGH A REFRIGERATOR AT A RATE WHICH WILL INSURE THAT THE CONCENTRATION OF SAID SOLVENT IS ALWAYS AT LEAST NINETY PER CENT (90%) OF THE TOTAL VOLUME.
Claim 2
Dependent Claim
85 words
THE PROCESS OF DRYING A WET, HEAT SENSITIVE, BIOLOGICALLY ACTIVE SUBSTANCE CONTAINING AN AQUEOUS PHASE COMPRISING: FREEZING SAID SUBSTANCE, CONTINUOUSLY FLOWING A BODY OF COLD, HIGHLY VOLATILE, WATER-MISCIBLE, ORGANIC SOLVENT INERT WITH RESPECT TO SAID FROZEN SUBSTANCE IN CLOSED CIRCUIT THROUGH A BODY OF FROZEN FRAGMENTS OF SAID SUBSTANCE, THROUGH A BODY OF A REGENERABLE CHEMICAL DESICCANT AND THROUGH A REFRIGERATOR AT A RATE WHICH WILL INSURE THAT THE CONCENTRATION OF SAID SOLVENT IS ALWAYS AT LEAST NINETY PER CENT (90%) OF THE TOTAL VOLUME.
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) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |