US Patent 10065775 Dispensing cap for a container

A dispensing cap for a container includes a body portion and an integrally formed chamber for holding an additive substance. An inner wall integrally formed with the body portion defines the chamber whose open end is sealed by a chamber closure member. The chamber closure member being configured for cooperating with the inner wall and seal the chamber, wherein the body portion, the closed top end, the plunger, and the inner wall are integrally formed.