US3732918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bottom-freezing apparatus
Assignee: United States Department of the Navy
•
Filing: 1971-03-11
•
Granted: 1973-05-15
•
Expires: 1991-03-11
Abstract
Abstract A bottom-freezing cell which operates on the liquid natural convection principle but contains no internal ducting and no insulating dividers. Additional body sections may be connected to the cell to obtain any desired cell length.
Inventors
- 👤 T Culbertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:24
CPC Classifications
F; F28; F28D; F28D15/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A refrigerator cell operating on the liquid natural convection method comprising: a hollow elongated cylindrical cell formed of at least three detachable sections with the upper and bottom sections having closed ends; a series of heat dissipating fins attached to and spaced about the top periphery of said upper section; means interconnecting the sections of the cell which permits varying the length of the cell; said interconnecting means adapted to provide said cell with a smooth unobstructed outer surface from the bottom of the fins to the closed end of the bottom section; a non-freezing liquid of low-viscosity and high specific heat substantially filling said cell; a heater positioned in heat conducting relationship with respect to said bottom section to provide facile removal of the cell from the ice sheet; thus convection of the fluid within said cell occurs because of the temperature differential existing between the upper and lower portions of the cell.
Claim 2
Dependent Claim
154 words
A refrigerator cell operating on the liquid natural convection method comprising: a hollow elongated cylindrical cell formed of at least three detachable sections with the upper and bottom sections having closed ends; a series of heat dissipating fins attached to and spaced about the top periphery of said upper section; means interconnecting the sections of the cell which permits varying the length of the cell; said interconnecting means adapted to provide said cell with a smooth unobstructed outer surface from the bottom of the fins to the closed end of the bottom section; a non-freezing liquid of low-viscosity and high specific heat substantially filling said cell; a heater positioned in heat conducting relationship with respect to said bottom section to provide facile removal of the cell from the ice sheet; thus convection of the fluid within said cell occurs because of the temperature differential existing between the upper and lower portions of the cell.
Claim 3
Dependent Claim
17 words
The refrigeration cell of claim 1 wherein said interconnecting means are threaded internal couplings between the sections.
Claim 4
Dependent Claim
13 words
The refrigeration cell of claim 2 wherein said heater is an electrical heater.
Claim 5
Dependent Claim
14 words
The refrigeration cell of claim 2 wherein said heater is an exothermic chemical heater.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |