US3304739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling system for passenger compartments of vehicles
Assignee: Douglas Aircraft Co Inc
•
Filing: 1965-08-31
•
Granted: 1967-02-21
•
Expires: 1985-08-31
Abstract
No abstract record available.
Inventors
- 👤 Edward H Erath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:05
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/32; B60H1/3202
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A COOLING SYSTEM FOR A COMPARTMENT OF VEHICLES TO BE OCCUPIED BY PERSONS, WHICH COMPRISES IN COMBINATION AN ENCLOSED RESERVOIR CONTAINING AN EXPENDABLE LIQUEFIED GAS REFRIGERANT, A COMPARTMENT ADAPTED FOR OCCUPATION BY PERSONS, A LIQUID SUPPLY CONDUIT ONE END OF WHICH IS POSITIONED IN SAID RESERVOIR BELOW THE LEVEL OF LIQUID GAS THEREIN, THE OPPOSITE END OF SAID CONDUIT BEING IN HEAT EXCHANGE RELATION WITH THE ATMOSPHERE IN SAID COMPARTMENT, MEANS FOR SENSING AND VENTING EXCESS GAS PRESSURE
Claim 2
Dependent Claim
78 words
A COOLING SYSTEM FOR A COMPARTMENT OF VEHICLES TO BE OCCUPIED BY PERSONS, WHICH COMPRISES IN COMBINATION AN ENCLOSED RESERVOIR CONTAINING AN EXPENDABLE LIQUEFIED GAS REFRIGERANT, A COMPARTMENT ADAPTED FOR OCCUPATION BY PERSONS, A LIQUID SUPPLY CONDUIT ONE END OF WHICH IS POSITIONED IN SAID RESERVOIR BELOW THE LEVEL OF LIQUID GAS THEREIN, THE OPPOSITE END OF SAID CONDUIT BEING IN HEAT EXCHANGE RELATION WITH THE ATMOSPHERE IN SAID COMPARTMENT, MEANS FOR SENSING AND VENTING EXCESS GAS PRESSURE
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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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |