US3255534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum apparatus
Assignee: United Fruit Co
•
Filing: 1963-03-21
•
Granted: 1966-06-14
•
Expires: 1983-03-21
Abstract
No abstract record available.
Inventors
- 👤 Kan Billy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:02
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/04; F26B5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A FREEZE DRYING APPARATUS COMPRISING FIRST AND SECOND FREEZE DRYING CHAMBERS, VACUUM PUMP MEANS OPERATIVELY CONNECTED TO THE CHAMBERS TO MAINTAIN LOW PRESSURES IN BOTH CHAMBERS AT THE SAME TIME, CONDENSER MEANS OPERATIVELY CONNECTED TO THE CHAMBERS TO MAINTAIN A LOW EQUILIBRIUM PARTIAL PRESSURE OF WATER VAPOR, AND MEANS FOR CIRCULATING INERT GAS BACK AND FORTH BETWEEN THE CHAMBERS A MULTIPLICITY OF TIMES WITHOUT OPENING THE CHAMBER TO THE ATMOSPHERE, SAID APPARATUS COMPRISING A CHARGE OF DRY INERT GAS.
Claim 2
Dependent Claim
79 words
A FREEZE DRYING APPARATUS COMPRISING FIRST AND SECOND FREEZE DRYING CHAMBERS, VACUUM PUMP MEANS OPERATIVELY CONNECTED TO THE CHAMBERS TO MAINTAIN LOW PRESSURES IN BOTH CHAMBERS AT THE SAME TIME, CONDENSER MEANS OPERATIVELY CONNECTED TO THE CHAMBERS TO MAINTAIN A LOW EQUILIBRIUM PARTIAL PRESSURE OF WATER VAPOR, AND MEANS FOR CIRCULATING INERT GAS BACK AND FORTH BETWEEN THE CHAMBERS A MULTIPLICITY OF TIMES WITHOUT OPENING THE CHAMBER TO THE ATMOSPHERE, SAID APPARATUS COMPRISING A CHARGE OF DRY INERT GAS.
References Cited (Backward Citations)
US1799248A
Cited
US2380339A
Cited
US2480146A
Cited
US2477959A
Cited
US2574298A
Cited
US2621492A
Cited
US2994132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |