Patent ID: 9061248
Filing Date: 2015-06-23
Classification: B01D,B01L,B81B,B81C,F04B

Abstract:
1. A process for manufacturing a micromechanical structure, comprising: forming a buried cavity within a body of semiconductor material having a top surface, said buried cavity being separated from said top surface by a first surface layer of said body; and forming a first access duct configured to enable fluid communication between said buried cavity and an environment external to said body; forming an etching mask on said top surface at a first access area; forming a second surface layer on said top surface and said etching mask; removing by etching, at said first access area, a portion of said second surface layer, and an underlying portion of said first surface layer not covered by said etching mask until said buried cavity is reached, said etching thus forming both said first access duct and a filter element, set between said first access duct and said buried cavity and formed by a remaining portion of said first surface layer covered by said etching mask.