Metal working – Means to assemble or disassemble – Heat exchanger
Reexamination Certificate
2009-06-16
2011-10-18
Afzali, Sarang (Department: 3726)
Metal working
Means to assemble or disassemble
Heat exchanger
C029S726000, C029S727000, C029S523000, C029S890040, C029S890044
Reexamination Certificate
active
08037595
ABSTRACT:
An improved hairpin expander machine equipped with a closed-loop-controlled hydraulically positioned bolster plate and a heat exchanger-holding fixture characterized by a full-length, continuous front plate, back plate, and side rails. The hairpin expander includes a novel heat exchanger bottom end plate clamping mechanism as part of the fixture. These features enable the hairpin expander to provide larger expansion ratios and exert greater forces with tighter control, which is required for producing heat exchangers with reduced diameter hairpin tubes according to a preferred embodiment of the invention.
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International Search Report and Written Opinion of PCT/US2009/047400 dated Jul. 28, 2009.
Dees Dan
Garza Eric
Merschat Stephen
Mosser Sean
Overturff Andrew
Afzali Sarang
Andrews & Kurth LLP
Cooke Brett T.
Goodman Global, Inc.
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