Patent ID: 11971284
Assignee: STMICROELECTRONICS S.R.L.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 12:
13. A Coriolis-force-based flow sensing device, comprising:
a substrate including a first surface;
an insulating layer on the first surface of the substrate;
at least one driving electrode on the insulating layer; and
a structural body including:
a second surface opposite to a third surface, the third surface facing the first surface of the substrate;
a suspended portion that overlaps and is suspended over the driving electrode;
a buried channel within the suspended portion, the buried channel being between the second surface and the third surface;
a first structural layer on the insulating layer;
a second structural layer on the first structural layer, the second structural layer including a plurality of apertures that extend through the second structural layer; and
a porous layer on the second structural layer and in the plurality of apertures, the porous layer at least partially delimiting the buried channel, and the porous layer including pores permeable to an etching fluid; and

a chamber in the structural body at the third surface, the chamber being between the structural body and the first surface of the substrate, the at least one driving electrode being in the chamber.