Ventilation mask with heat and moisture exchange device Grant US-9878121-B2 United States of America 30 Jan 2018
Ventilation mask with integrated piloted exhalation valve and method of ventilating a… Grant US-9486602-B2 United States of America 08 Nov 2016
Ventilation mask with integrated piloted exhalation valve Grant US-9415183-B2 United States of America 16 Aug 2016
Ventilation mask with integrated piloted exhalation valve Grant US-9327092-B2 United States of America 03 May 2016