Patent ID: 7977786
Filing Date: 2011-07-12
Classification: B81B,B81C

Abstract:
1. A method of making microelectromechanical (MEMS) devices, the method comprising: forming one or more channels in at least one of first and second substrates, at least one of the channels are formed around at least one MEMS device area formed on the first substrate; applying one or more seal rings over at least a portion of the formed channels; and attaching a second substrate to the seal ring, wherein the one or more channels comprises a first section having a first cross-sectional area and a second section having a second cross-sectional area; wherein the one of more channels each define a free space passage from the MEMS device area that is traversable to gasses; wherein a cross-sectional area of the free space passage is smaller at the first cross-sectional area than at the second cross-sectional area; and wherein at least one transition from the first section to the second section occurs in the portion of the formed channels covered by the one or more seal rings.