Patent attributes
A lid assembly may include a lid member having a base wall with a drinking opening. A top surface of the base wall may include a groove portion forming a groove on the top of the lid member and a central protruding portion located adjacent to the groove portion. A blocking member may removably rest on the top surface of the lid member and be movable in rotational movement between a blocked position characterized by the blocking member blocking the drinking opening and an unblocked position characterized by the blocking member unblocking the drinking opening. Positioning holding structure may be provided to resist movement of the blocking member out of each of the blocked and unblocked positions, and thereby releasably hold the blocking member in each of the blocked and unblocked positions.