ALEXANDRIA, Va., May 26 -- United States Patent no. 12,636,554, issued on May 26.
"Golf club shaft extension system" was invented by Frederick Cleeves (Phoenix).
According to the abstract* released by the U.S. Patent & Trademark Office: "A golf club shaft extension system including an extension plug having a tube portion with an adjustable grip portion thereon, wherein the tube portion is adapted to be placed within an opened grip end of a hollow shaft of a golf club to thereby extend the length of the shaft of the golf club, and a shrinkable grip sleeve formed from a flexible and heat-shrinkable material that is placed over the extension plug and existing grip of the golf club and heat shrunk to secure the extension plug in place upon th...