Patent US3281371A successfully refreshed from Google Patents.
US3281371A
Expired / Lapsed
US
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Method and article of freeze-drying
Assignee: GE Chemicals Inc
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Filing: 1963-01-14
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Granted: 1966-10-25
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Expires: 1983-01-14
Abstract
No abstract record available.
Inventors
- 👤 Nerge Wilhelm
- 👤 Hackenberg Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:45
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/04; F26B5/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
69 words
A METHOD FOR TREATING WATER CONTAINING RADIOACTIVE WASTE MATERIAL WHICH COMPPRISES THE STEPS OF PACKAGING THE WATER CONTAINING RADIOACTIVE WASTE MATERIAL WITH A FILTER MATERIAL WHICH IS IMPERMEABLE TO SOLID RADIOACTIVE MATERIAL BUT POROUS TO SUBLIMATING WATER VAPORS, AND FREEZE-DRYING SAID PACKAGED RADIOACTIVE WASTE MATERIAL BY PASSING SUBLIMATING WATER VAPORS THROUGH SAID FILTER MATERIAL SO AS TO REDUCE THE VALUME OF RADIOACTIVE WASTE MATERIAL WITHIN SAID FILTER MATERIAL PACKAGE.
Claim 2
Independent Claim
69 words
A METHOD FOR TREATING WATER CONTAINING RADIOACTIVE WASTE MATERIAL WHICH COMPPRISES THE STEPS OF PACKAGING THE WATER CONTAINING RADIOACTIVE WASTE MATERIAL WITH A FILTER MATERIAL WHICH IS IMPERMEABLE TO SOLID RADIOACTIVE MATERIAL BUT POROUS TO SUBLIMATING WATER VAPORS, AND FREEZE-DRYING SAID PACKAGED RADIOACTIVE WASTE MATERIAL BY PASSING SUBLIMATING WATER VAPORS THROUGH SAID FILTER MATERIAL SO AS TO REDUCE THE VALUME OF RADIOACTIVE WASTE MATERIAL WITHIN SAID FILTER MATERIAL PACKAGE.
Claim 3
Independent Claim
86 words
A METHOD OF FREEZ-DRYING WHICH COMPRISES THE STEPS OF PREPARING A SUBSTANCE FOR DRYING, COATING SAID SUBSTANCE WITH A MATERIAL WHICH IS POROUS TO SUBLIMATING WATER VAPOR, FREEZING THE SUBSTANCE TO BE DRIED, SUBJECTING THE FROZEN SUBSTANCE TO A REDUCE PRESSURE SO AS TO CAUSE SUBLIMATION OF SUBSTANTIALLY ALL THE FROZEN MOISTURE IN THE FROZEN SUBSTANCE, AND TREATING SAID COATING MATERIAL WHILE SAID SUBSTANCE IS MAINTAINED UNDER VACUUM SO AS TO RENDER SAID COATING MATERIAL IMPERMEABLE THEREBY PROVIDING A VACUUM TIGHT PACKAGE FOR SAID FREEZE-DRIED SUBSTANCE.
Claim 4
Independent Claim
86 words
A METHOD OF FREEZ-DRYING WHICH COMPRISES THE STEPS OF PREPARING A SUBSTANCE FOR DRYING, COATING SAID SUBSTANCE WITH A MATERIAL WHICH IS POROUS TO SUBLIMATING WATER VAPOR, FREEZING THE SUBSTANCE TO BE DRIED, SUBJECTING THE FROZEN SUBSTANCE TO A REDUCE PRESSURE SO AS TO CAUSE SUBLIMATION OF SUBSTANTIALLY ALL THE FROZEN MOISTURE IN THE FROZEN SUBSTANCE, AND TREATING SAID COATING MATERIAL WHILE SAID SUBSTANCE IS MAINTAINED UNDER VACUUM SO AS TO RENDER SAID COATING MATERIAL IMPERMEABLE THEREBY PROVIDING A VACUUM TIGHT PACKAGE FOR SAID FREEZE-DRIED SUBSTANCE.
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |