Patent ID: 6945688

Claim:
A container assembly for mixing materials comprising: a base having a top surface and an inner wall with said inner wall defining an upper surface and a mixing chamber for mixing the materials with said upper surface including a chamfer angling inwardly from said top surface toward said inner wall; a cover having an outer periphery and being selectively mounted to said base covering said mixing chamber and being removable from said base exposing said mixing chamber; and a sealing portion spaced inwardly from said outer periphery and depending from said cover to a distal end with said sealing portion engaging said upper surface of said inner wall when said cover is mounted to said base; said sealing portion being at least partially flexible and angled outwardly toward said outer periphery such that during said engagement of said sealing portion with said upper surface, said chamfer guides said distal end of said sealing portion into said mixing chamber and said sealing portion flexes and conforms to said upper surface to seal said mixing chamber for preventing an escape of material from said mixing chamber.