US Patent 7153452 - Carbon Nanotube Re-enforced Carbon Fiber

http://www.freepatentsonline.com/7153452.pdf

Carbon fiber materials are lightweight, durable, and possess high strength. However, minute flaws can reduce these qualities. This patent teaches providing a fractional percentage of carbon nanotubes to prevent such flaws during manufacture. Claim 1 reads:

1. A modified, mesophase pitch-based carbon fiber comprising from about 0.05 percent to about 1.0 percent by weight of carbon nanomaterial reinforcements.