US Patent 7682265 - Adaptive golf ball using magnetic nanoparticles

http://www.freepatentsonline.com/7682265.html

This patent teaches an interesting design for a liquid core golf ball offering some advantages when used with a magnetic golf club head or when interacting with the Earth's magnetic field during flight. Claim 1 reads:

1. A golf ball comprising:

an inner core; one or more mantle layers surrounding the inner core; and

an outer cover surrounding the mantle layer(s),

wherein the inner core is further comprised of a permanent magnet immersed in a ferrofluid, and the ferrofluid is further comprised of a colloidal suspension of nanometer-sized, single domain, magnetic particles immersed in a carrier liquid.