Patent ID: 8534459

Claim:
A cancellation feature for a pharmaceutical waste disposal assembly, the pharmaceutical waste disposal assembly having a first surface and a second surface, the cancellation feature comprising: a first cancellation member that is secured to the first surface, the first cancellation member including a first member node that cantilevers away from the first surface; and a second cancellation member that is secured to the second surface, the second cancellation member automatically moving from (i) an engaged configuration wherein the second cancellation member is engaged with the first cancellation member to (ii) a post-engaged configuration that inhibits engagement with the first cancellation member, the automatic movement occurring when the second cancellation member and the first cancellation member are disengaged from one another, the second cancellation member including a second member body having a second member aperture that receives the first member node, the second member body forming a body recess, and wherein when the second cancellation member is in the engaged configuration, the first member node extends fully through the second member aperture and into the body recess, wherein the second cancellation member is inhibited from being moved from the post-engaged configuration to the engaged configuration, and wherein when the second cancellation member is in the post-engaged configuration, the first member node is inhibited from extending fully through the second member aperture and into the body recess.