US3789616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evaporation system
Assignee: BOC Group Ltd
•
Filing: 1971-06-23
•
Granted: 1974-02-05
•
Expires: 1991-06-23
Abstract
Abstract A system for preserving perishable goods in an enclosed transport container including an insulated evaporator for liquefied gas arranged to produce a layer of cold dense gas to envelop the goods and to maintain them at a temperature below ambient.
Inventors
- 👤 H Davidge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:52
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/02; B65D90/06; B65D88/00; B65D88/74; B65D88/745; F; F17; F17C; F17C9/00; F17C9/02; F25; F25D; F25D3/00; F25D3/10; F25D3/105; F17C2201/00; F17C2201/01; F17C2201/0147; F17C2201/0157; F17C2223/00; F17C2223/04; F17C2223/042; F17C2223/043; F17C2223/045
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
133 words
In combination with an enclosed cold storage container, an unpressurized liquefied cryogenic gas evaporator for supplying evaporated gas to said container, said evaporator having a shell formed of gas-impermeable material, a layer of insulating material on the outside of said shell, an inlet into said evaporator for the introducing of liquefied gas, and unconstricted vapour outlet means in the top of said evaporator, said vapour outlet means having a minimum area of 491 square mm, a maximum area equal to one-eighth of the upper surface area of the liquid in the evaporator, and leading directly to the enclosed container to permit the escape by direct evaporation of dense, nonturbulent evaporated cooling gas, said gas flowing out of said outlet means and over goods stored within said container to form an insulating blanket thereover.
Claim 2
Dependent Claim
133 words
In combination with an enclosed cold storage container, an unpressurized liquefied cryogenic gas evaporator for supplying evaporated gas to said container, said evaporator having a shell formed of gas-impermeable material, a layer of insulating material on the outside of said shell, an inlet into said evaporator for the introducing of liquefied gas, and unconstricted vapour outlet means in the top of said evaporator, said vapour outlet means having a minimum area of 491 square mm, a maximum area equal to one-eighth of the upper surface area of the liquid in the evaporator, and leading directly to the enclosed container to permit the escape by direct evaporation of dense, nonturbulent evaporated cooling gas, said gas flowing out of said outlet means and over goods stored within said container to form an insulating blanket thereover.
Claim 3
Dependent Claim
24 words
A container as claimed in claim 1, wherein the mean thermal conductivity of the evaporator is within the range 0.08 to 0.155 BTU/sq ft/inch/*F/hour.
Claim 4
Dependent Claim
26 words
A container as claimed in claim 1, wherein the vapor outlet means is located at a high level with respect to the floor of the container.
Claim 5
Dependent Claim
45 words
A container as claimed in claim 1, wherein the evaporator is located at a low level with respect to the floor of the container and is provided with a chimney to convey the dense gas to a relatively high level with respect to said floor.
Claim 6
Dependent Claim
15 words
A container as claimed in claim 1, wherein the evaporator shell is constructed from metal.
Claim 7
Dependent Claim
17 words
A container as claimed in claim 1, wherein the evaporator shell is constructed from a plastic material.
Claim 8
Dependent Claim
23 words
A container as claimed in claim 1, wherein the evaporator shell is a composite structure of alternate layers of metal and plastic materials.
Claim 9
Dependent Claim
22 words
A container as claimed in claim 1, wherein the vapour outlet means is centrally disposed in the upper surface of the evaporator.
Claim 10
Dependent Claim
29 words
A container as claimed in claim 1, wherein the evaporator has an inner shell and an outer shell and the upper inner surface of the inner shell is perforated.
Claim 11
Dependent Claim
20 words
A container as claimed in claim 1, wherein the insulating layer of the evaporator is enclosed within an outer shell.
Claim 12
Dependent Claim
16 words
A container as claimed in claim 10, wherein the insulating layer is provided by a gas.
Claim 13
Dependent Claim
20 words
A container as claimed in claim 1, wherein the insulating layer of the evaporator is formed from a solid insulant.
Claim 14
Dependent Claim
16 words
A container as claimed in claim 12, wherein the soLid insulant is a foamed plastic material.
Claim 15
Dependent Claim
16 words
A container as claimed in claim 1, wherein the evaporator is provided with a drip tray.
Claim 16
Dependent Claim
22 words
A container as claimed in claim 14, wherein the drip tray has a drainage tube communicating with the exterior of the container.
Claim 17
Dependent Claim
18 words
A container as claimed in claim 1, wherein the interior of the evaporator is fitted with support members.
Claim 18
Dependent Claim
20 words
A container as claimed in claim 16, wherein the support members are perforated baffle plates laterally disposed in the evaporator.
Claim 19
Dependent Claim
19 words
A container as claimed in claim 1, wherein the evaporator is of elongated shape with its longest dimension vertical.
Claim 20
Dependent Claim
15 words
A container as claimed in claim 18, wherein the evaporator is of oval horizontal cross-section.
Claim 21
Dependent Claim
23 words
A container as claimed in claim 1, and including a supply pipe leading from the inlet to a supply port outside the container.
Claim 22
Dependent Claim
20 words
A container as claimed in claim 20, wherein said pipe leading from the inlet is enclosed in a protective layer.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |