US2775683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchangers for vaporizing liquid refrigerant
Assignee: Dole Refrigerating Co
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Filing: 1954-07-16
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Granted: 1956-12-25
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Expires: 1974-07-16
Abstract
No abstract record available.
Inventors
- 👤 Herman W Kleist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:40
CPC Classifications
F; F25; F25B; F25B43/00; F28; F28D; F28D7/00; F28D7/10; F28D7/106; F28D20/00; F28D2020/0004; F28D2020/0013; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36; F28F1/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN A HEAT EXCHANGER ADAPTED FOR VAPORIZING A VOLATILE REFRIGERANT, A CENTRAL, GENERALLY CYLINDRICAL CORE, A HELICAL VANE EXTENDING ABOUT SAID CORE, OF A PITCH SUBSTANTIALLY LESS THAN THE DIAMETER OF THE HELIX, A JACKET ENGAGING THE OUTER EDGES OF SAID VANE AND FORMING WITH SAID VANE AND CORE A HELICAL PASSAGE EXTENDING SUBSTANTIALLY FROM END TO END OF THE CORE, AN INLET DUCT EXTENDING TO ONE END OF SAID PASSAGE AND AN OUTLET DUCT EXTENDING FROM THE OPPOSITE END OF THE PASSAGE, A RESISTANCE HEATER IN SAID CORE EXTENDING GENERALLY FROM END TO END OF THE PASSAGE, AND A HEAT RESPONSIVE ELEMENT CONDUCTIVELY CONNECTED TO SAID RESISTANCE HEATER AND POSITIONED AND ADAPTED TO MAKE AND BREAK AN ELECTRIC CIRCUIT FOR SAID HEATER IN RESPONSE TO PREDETERMINED CHANGES IN TEMPERATURE OF FLUID FLOWING THROUGH SAID PASSAGE.
Claim 2
Dependent Claim
136 words
IN A HEAT EXCHANGER ADAPTED FOR VAPORIZING A VOLATILE REFRIGERANT, A CENTRAL, GENERALLY CYLINDRICAL CORE, A HELICAL VANE EXTENDING ABOUT SAID CORE, OF A PITCH SUBSTANTIALLY LESS THAN THE DIAMETER OF THE HELIX, A JACKET ENGAGING THE OUTER EDGES OF SAID VANE AND FORMING WITH SAID VANE AND CORE A HELICAL PASSAGE EXTENDING SUBSTANTIALLY FROM END TO END OF THE CORE, AN INLET DUCT EXTENDING TO ONE END OF SAID PASSAGE AND AN OUTLET DUCT EXTENDING FROM THE OPPOSITE END OF THE PASSAGE, A RESISTANCE HEATER IN SAID CORE EXTENDING GENERALLY FROM END TO END OF THE PASSAGE, AND A HEAT RESPONSIVE ELEMENT CONDUCTIVELY CONNECTED TO SAID RESISTANCE HEATER AND POSITIONED AND ADAPTED TO MAKE AND BREAK AN ELECTRIC CIRCUIT FOR SAID HEATER IN RESPONSE TO PREDETERMINED CHANGES IN TEMPERATURE OF FLUID FLOWING THROUGH SAID PASSAGE.
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) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |