If your looking for some US heatpipe manufacturers, heres a few links:
Aavid Termalloy
Concord, NH
www.aavidthermalloy
ADDA Corp.
Campbell, CA
www.addathermal.com
Delta Engineers
Sunset Beach, CA
(714)840-9673
deltaengineers@usa.com
Enertron, Inc.
Mesa, AZ
www.enertron-inc.com
Noren Products, Inc
Menlo Park, CA
www.norenproduct.com
Radian Heatsinks
Santa Clara, CA
www.radianheatsinks.com
Thermacore, Inc
Lancaster, PA
www.thermacore.com
Thermshield, LLC
Gilford, NG
www.thermshield.com
Hope that helped. If you need, I can post phone numbers for those companies, but I'm sure their sites have it somewhere on there.