US3800868A — Heat exchanger

Claim 1

Independent Claim 269 words

A liquid-to-gas heat exchanger comprising: a. A hollow body having a ribbonlike liquid passage therethrough undulating in the liquid flow direction and having a substantially constant crosssection, the cross-section as viewed in any plane perpendicular to its flow direction being of elongated form dEfined by a pair of relatively long parallel sides joined by a pair of substantially shorter sides; b. said hollow body having a twopart rigid die-cast construction with the two parts being bonded together at a generaly planar junction with the plane of the junction passing through the liquid passage between and generally parallel to the long sides of the passage, the undulating form of the passage being produced by corrugations normal to the general direction of flow in the passage portion of each body part, the corrugations of one body part being positioned in a staggered relation to those of the other body part with the crests of the corrugations in one part being opposed to the troughs of the corrugations in the other part to maintain the substantially constant cross-section of the flow passage, the crests of the corrugations being sufficiently high to substantially impede a clear line of sight along the flow direction of the passage; c. each of the two hollow parts of the body having a plurality of spaced parallel fins die-cast integral therewith and projecting outwardly therefrom for coolant gas flow between said fins, the height of the fins being a plurality of times greater than the spacing therebetween; and d. the undulations of the liquid passage directing the liquid flow alternately against the gas-cooled sides of the hollow body.

Claim 2

Dependent Claim 269 words

A liquid-to-gas heat exchanger comprising: a. A hollow body having a ribbonlike liquid passage therethrough undulating in the liquid flow direction and having a substantially constant crosssection, the cross-section as viewed in any plane perpendicular to its flow direction being of elongated form dEfined by a pair of relatively long parallel sides joined by a pair of substantially shorter sides; b. said hollow body having a twopart rigid die-cast construction with the two parts being bonded together at a generaly planar junction with the plane of the junction passing through the liquid passage between and generally parallel to the long sides of the passage, the undulating form of the passage being produced by corrugations normal to the general direction of flow in the passage portion of each body part, the corrugations of one body part being positioned in a staggered relation to those of the other body part with the crests of the corrugations in one part being opposed to the troughs of the corrugations in the other part to maintain the substantially constant cross-section of the flow passage, the crests of the corrugations being sufficiently high to substantially impede a clear line of sight along the flow direction of the passage; c. each of the two hollow parts of the body having a plurality of spaced parallel fins die-cast integral therewith and projecting outwardly therefrom for coolant gas flow between said fins, the height of the fins being a plurality of times greater than the spacing therebetween; and d. the undulations of the liquid passage directing the liquid flow alternately against the gas-cooled sides of the hollow body.

Claim 3

Dependent Claim 45 words

The combination recited in claim 1, wherein the crests and the troughs of the corrugations are rounded and the troughs are rounded on a larger radius than the crests to maintain substantial parallelism of the flow surfaces and substantially constant cross-section of the flow passage.

Claim 4

Dependent Claim 33 words

The combination recited in claim 1, wherein the crests of the corrugations of the flow passage do not project beyond the plane of the junction of the two parts of the hollow body.

Claim 5

Dependent Claim 33 words

The combination recited in claim 3, wherein the crests of the corrugations of the flow passage are approximately flush with the plane of the junction of the two parts of the hollow body.

Claim 6

Dependent Claim 26 words

The combination recited in claim 1, wherein the liquid passage is serpentined in a plurality of parallel bights in a common plane through the hollow body.

Claim 7

Dependent Claim 30 words

The combination recited in claim 5, wherein the fins extend across the exterior of the hollow body in a direction generally transverse to the flow direction of the liquid passage.

Claim 8

Dependent Claim 133 words

The combination recited in claim 5, wherein the fins of each of the two body parts are extended around one edge of the body to the junction plane, the edges of the fins of the two parts being bonded together at the junction plane, the outermost edges of the fins having a sheet cover member bonded thereto continuously along the edge of each fin to define non-communicating gas passages between the fins, the fin cover being continuous from one side of the body around the bonded portions of the fins to the other side of the body and defining coolant gas passages continuous from one side of the body to the other, the gas passages being open only at their ends and having their open ends at the same edge of the body.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-04-01	1977-10-01	1978-04-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-04-01	1981-10-01	1982-04-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-04-01	1985-10-01	1986-04-02	$7700.00	Window Closed / Lapsed

Heat exchanger

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