Today in 1985, US Patent 4555034 A was issued, an invention of Ludwig Gerhards, for his “Beer Mug.” Here’s the Abstract:

A beer mug is formed of the mug container and a lid made out of wood. The lid is hingedly connected to the handle secured to the mug container and can be releasably attached to the handle by a snapping connecting device which includes a connecting element of an elastic plastics on the lid and a hinge mounted on the handle and provided with a pivot which can be snapped into a slot formed on the end portion of the elastic connecting element.