Patent ID: 6879035

Claim:
A lid for an integrated circuit device comprising: a lid wafer having a sealing surface; a cavity formed in the lid wafer; a sealing structure disposed around the cavity for sealing the lid wafer to the device wafer, the sealing structure including a bonding adhesion structure coupled to the sealing surface of the lid wafer and a bonding layer coupled to the bonding adhesion structure such that the bonding layer is at least substantially separated from the sealing surface of the lid wafer by the bonding adhesion structure; and an at least substantially continuous retaining structure formed in the sealing surface of the lid wafer and disposed around the cavity and between the cavity and the sealing structure for retaining excess material of the bonding layer and preventing the material of the bonding layer from entering the cavity, the retaining structure being defined in part by a pair of side walls extending at least substantially continuously around the cavity.