US3820355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable refrigerator and freezer
Assignee: Individual
•
Filing: 1973-04-23
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Granted: 1974-06-28
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Expires: 1993-04-23
Abstract
Abstract An insulated container is provided with a first and second insulated compartment, one of which is for receiving solid carbon dioxide. Metal is positioned to communicate the cooling effect of the carbon dioxide as it changes to fluid from the first compartment to the second compartment. Removable closures are provided for each of the compartments as well as the container and a conduit extends from the first compartment and terminates in an opening in the container so that the carbon dioxide as it changes to fluid may be vented to atmosphere. A restriction is provided in the conduit to regulate or control the rate fluid flow of the carbon dioxide.
Inventors
- 👤 J Olivares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:49
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/12; F25D3/14; F25D2331/00; F25D2331/80; F25D2331/804
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A portable refrigerator and freezer comprising: a. an open top insulated container having side, end and bottom walls; b. a first insulated compartment within the container for receiving solid carbon dioxide; c. a second insulated compartment adjacent said first insulated compartment; d. metal means extending from said first compartment to said second compartment to transfer the cooling effect of the solid carbon dioxide; e. removable insulated closures for each of said compartments; f. conduit means extending from said first compartment in heat exchange relation with said container for venting carbon dioxide gas to atmosphere; and g. restriction means in said conduit to restrict the flow of carbon dioxide gas from said first compartment to the atmosphere.
Claim 2
Dependent Claim
116 words
A portable refrigerator and freezer comprising: a. an open top insulated container having side, end and bottom walls; b. a first insulated compartment within the container for receiving solid carbon dioxide; c. a second insulated compartment adjacent said first insulated compartment; d. metal means extending from said first compartment to said second compartment to transfer the cooling effect of the solid carbon dioxide; e. removable insulated closures for each of said compartments; f. conduit means extending from said first compartment in heat exchange relation with said container for venting carbon dioxide gas to atmosphere; and g. restriction means in said conduit to restrict the flow of carbon dioxide gas from said first compartment to the atmosphere.
Claim 3
Dependent Claim
21 words
The invention of claim 1 wherein said metal means comprises plate means in the bottom of said first and second compartments.
Claim 4
Dependent Claim
20 words
The invention of claim 1 wherein said conduit from said first compartment extends along a side wall of said container.
Claim 5
Dependent Claim
12 words
The invention of claim 3 including insulated top means for said container.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |