US3176408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Freeze drying apparatus and method
Assignee: Pennwalt Corp
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Filing: 1961-07-24
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Granted: 1965-04-06
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Expires: 1981-07-24
Abstract
No abstract record available.
Inventors
- 👤 Manuel E Fuentevilla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:33
CPC Classifications
F; F26; F26B; F26B25/00; F26B25/22; F26B25/225; F26B5/00; F26B5/04; F26B5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
APPARATUS FOR FREEZE DRYING ARTICLES OF SUBSTANTIALLY THE SAME SIZE AND KIND COMPRISING A HOUSING HAVING A CHAMBER THEREIN, A SHELF WITHIN SAID CHAMBER, A TRAY FOR FROZEN ARTICLES TO BE FREEZE DRIED WITHIN SAID HOUSING, SAID TRAY BEING SUPPORTED ON SAID SHELF, MEANS FOR FREEZE DRYING THE ARTICLES IN SAID TRAY BY CAUSING ICE IN THE FROZEN SPECIMENS TO SUBLIME, AND MEANS RESPONSIVE TO THE LOSS OF WEIGHT OF THE ARTICLES FOR AUTOMATICALLY CONTROLLING SAID FREEZE DRYING MEANS, SAID LAST-MENTIONED MEANS INCLUDING AT LEAST ONE LOAD CELL SUPPORTING THE WEIGHT OF SAID TRAY AND THE ARTICLES TO BE FREEZE DRIED, WHEREBY AN ELECTRICAL SIGNAL MAY BE GENERATED WHICH VARIES IN ACCORDANCE WITH THE CHANGE OF WEIGHT OF THE ARTICLES DUE TO THE SUBLIMATION OF ICE FROM THE ARTICLES.
Claim 2
Dependent Claim
129 words
APPARATUS FOR FREEZE DRYING ARTICLES OF SUBSTANTIALLY THE SAME SIZE AND KIND COMPRISING A HOUSING HAVING A CHAMBER THEREIN, A SHELF WITHIN SAID CHAMBER, A TRAY FOR FROZEN ARTICLES TO BE FREEZE DRIED WITHIN SAID HOUSING, SAID TRAY BEING SUPPORTED ON SAID SHELF, MEANS FOR FREEZE DRYING THE ARTICLES IN SAID TRAY BY CAUSING ICE IN THE FROZEN SPECIMENS TO SUBLIME, AND MEANS RESPONSIVE TO THE LOSS OF WEIGHT OF THE ARTICLES FOR AUTOMATICALLY CONTROLLING SAID FREEZE DRYING MEANS, SAID LAST-MENTIONED MEANS INCLUDING AT LEAST ONE LOAD CELL SUPPORTING THE WEIGHT OF SAID TRAY AND THE ARTICLES TO BE FREEZE DRIED, WHEREBY AN ELECTRICAL SIGNAL MAY BE GENERATED WHICH VARIES IN ACCORDANCE WITH THE CHANGE OF WEIGHT OF THE ARTICLES DUE TO THE SUBLIMATION OF ICE FROM THE ARTICLES.
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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |