SOUND ABSORBER AND METHOD FOR PRODUCING SAME Application WO-2023198999-A1 World Intellectual Property Organisation (WIPO) 19 Oct 2023
ACOUSTIC METAMATERIAL AND METHOD FOR THE ADDITIVE MANUFACTURING THEREOF Application WO-2022234228-A2 World Intellectual Property Organisation (WIPO) 10 Nov 2022
Method and apparatus for measuring distortion and muffling of speech by a face mask Grant US-11295759-B1 United States of America 05 Apr 2022