I stumbled upon this page that lets you search for patents.
I put in "billiard" and this popped up.
filed October 11, 2007
patent holder: CHANG; Jung-Shih
A shaft of a cue stick for billiards or pool, includes an elongated tapered body laminated of a plurality of wood strips, each of the wood strips in cross-section having a sector section with an arcuate outer surface and an arc inner notch such that when the wood strips are laminated together, the arcuate outer surfaces form an outer surface of the body and the inner notches define an axial hole through the body; and a circular core tube made of a material having a greater rigidity than wood and having a shorter length than the axial hole, the tube being firmly received in the axial hole in such a way that the cue sticks body has a front hollow section extending a predetermined length along its axis from larger diameter to the smaller diameter end.
Full patent:
http://appft1.uspto.gov/netacgi/nph...ND&d=PG01&s1=billiard&OS=billiard&RS=billiard
I put in "billiard" and this popped up.
filed October 11, 2007
patent holder: CHANG; Jung-Shih
A shaft of a cue stick for billiards or pool, includes an elongated tapered body laminated of a plurality of wood strips, each of the wood strips in cross-section having a sector section with an arcuate outer surface and an arc inner notch such that when the wood strips are laminated together, the arcuate outer surfaces form an outer surface of the body and the inner notches define an axial hole through the body; and a circular core tube made of a material having a greater rigidity than wood and having a shorter length than the axial hole, the tube being firmly received in the axial hole in such a way that the cue sticks body has a front hollow section extending a predetermined length along its axis from larger diameter to the smaller diameter end.
Full patent:
http://appft1.uspto.gov/netacgi/nph...ND&d=PG01&s1=billiard&OS=billiard&RS=billiard