Patent ID: 9085455
Filing Date: 2015-07-21
Classification: B81B,B81C

Abstract:
1. A method for forming a microelectromechanical system (MEMS) device, the method comprising: forming a MEMS wafer having a first cavity; bonding a carrier wafer to a first side of the MEMS wafer, the bonding forming a second cavity, the second cavity having a second pressure, the second pressure being an ambient pressure; sealing the first cavity, wherein after the sealing the first cavity, the first cavity has a first pressure, the first pressure being less than the second pressure; and bonding a cap wafer to a second side of the MEMS wafer, the second side being opposite the first side, the bonding forming a third cavity, the third cavity having a third pressure, the third pressure being greater than the first pressure and less than the second pressure.