How long is the patent of bulk acoustic wave filter valid?

twenty years. The term of the invention patent right is 2 years, the term of the utility model patent right and the design patent right is 1 years, all of which are calculated from the application date, and the bulk acoustic wave filter patent is an invention patent. Compared with SAW filter, BAW filter is more suitable for high frequency, and BAW filter is insensitive to temperature change and has low insertion loss.