Patent ID: 8561825

Claim:
A drinking vessel, comprising: a first receptacle having a first circumferential side wall extending from a closed bottom end to a circumferential shoulder having a peripheral edge defining a first diameter; an externally-threaded attachment portion extending from the shoulder to a circumferential lip, the externally-threaded attachment portion having a second diameter that is smaller than the first diameter; a second receptacle configured to fit inside the first receptacle and having a second circumferential side wall extending from a closed bottom end to a circumferential upper rim defining an open top end; a circumferential flange depending downwardly from the circumferential upper rim so as to fit coaxially around the externally-threaded attachment portion and having a lower end separated from the shoulder by a circumferential gap, the circumferential flange having an outer surface and an internally-threaded portion configured to mate with the externally-threaded attachment portion; and a resilient element having a grip portion on the outer surface of the circumferential flange and a sealing portion configured to seal the circumferential gap; wherein the circumferential flange has a juncture with the circumferential upper rim that defines a circumferential groove, and wherein the grip portion of the resilient element includes a radially-inward extending peripheral bead that is received in the circumferential groove.