ALEXANDRIA, Va., June 25 -- United States Patent no. 12,338,031, issued on June 24.
"Stackable cup" was invented by Landon S. Wood (San Antonio).
According to the abstract* released by the U.S. Patent & Trademark Office: "A sippy cup stacking system comprising multiple substantially identical sippy cups having sippy spout lids that can be mated with the bottom of a first cup while attached to the top of a second cup. Each cup includes a bottom with an annular recess containing a central locking plug capable of mating with a central locking stem protruding from a lid on another cup. The sippy spout on each lid is radially offset from the locking stem and fits into and can move circumferentially in the annular recess on the bottom of the cu...