Heat exchange – Non-communicating coaxial enclosures – Helical conduit means
Reexamination Certificate
2011-01-11
2011-01-11
Ford, John K (Department: 3744)
Heat exchange
Non-communicating coaxial enclosures
Helical conduit means
C165S154000, C165S163000, C165S164000, C165S178000, C138S114000, C062S513000, C072S077000, C072S078000, C072S095000, C072S098000, C072S100000, C072S370190, C072S370210, C029S890036
Reexamination Certificate
active
07866378
ABSTRACT:
A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be readially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.
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Kurata Shun
Naganawa Hiroki
Nakamura Fumiaki
Ochiai Kinji
Ohara Hiroki
Denso Airs Corporation
Denso Corporation
Ford John K
Harness Dickey & Pierce PLC
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