Patent ID: 9285289
Filing Date: 2016-03-15
CPC Classification: B81B,B81C,G01L,H01L

Claim Text:
1. A microelectromechanical systems (MEMS) pressure sensor comprising: a sense cell; and a test cell, said sense and test cells being formed in proximity to one another on a common substrate, said test cell having a test cavity and a seal structure in communication with said test cavity, wherein each of said sense and test cells is sensitive to ambient pressure, said test cavity exhibits an initial cavity pressure when said seal structure is unbreached, and when said seal structure is breached said initial cavity pressure is changed to said ambient pressure, wherein said seal structure comprises a seal membrane spaced apart from said underlying substrate to produce a seal structure cavity and a channel interposed between said test cavity and said seal structure cavity, and said seal membrane is breached to change said initial cavity pressure within said test cavity to said ambient pressure.