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Assignee3M Innovative Properties Company
InventorsAli Berker, Sharon R. Garber, Richard W. Greger, Marie Aloshyna ep Lesuffleur, Smarajit Mitra
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A hearing protection process comprises (a) providing at least one hearing protection device comprising at least one sound barrier comprising at least one substantially periodic array of structures disposed in a first medium having a first density, the structures being made of a second medium having a second density different from the first density, wherein one of the first and second media is a viscoelastic medium having a speed of propagation of longitudinal sound wave and a speed of propagation of transverse sound wave, the speed of propagation of longitudinal sound wave being at least about 30 times the speed of propagation of transverse sound wave, and wherein the other of the first and second media is a viscoelastic or elastic medium; and (b) interposing the hearing protection device between an acoustic source and an acoustic receiver in the form of a human ear.
A process comprising (a) providing at least one hearing protection device comprising at least one sound barrier comprising at least one substantially periodic array of structures disposed in a first medium having a first density, said structures being made of a second medium having a second density different from said first density, wherein one of said first and second media is a viscoelastic medium having a speed of propagation of longitudinal sound wave and a speed of propagation of transverse sound wave, said speed of propagation of longitudinal sound wave being at least 30 times said speed of propagation of transverse sound wave, and wherein the other of said first and second media is a viscoelastic or elastic medium;
A process comprising (a) providing at least one acoustic earmuff device comprising at least one sound barrier comprising at least one one-dimensional, substantially periodic array of structures in the form of a multi-layer structure comprising alternating layers of a first medium having a first density and a second medium having a second density different from said first density, wherein one of said first and second media is a viscoelastic medium having a speed of propagation of longitudinal sound wave and a speed of propagation of transverse sound wave, said speed of propagation of longitudinal sound wave being at least 30 times said speed of propagation of transverse sound wave, and wherein the other of said first and second media is a viscoelastic or elastic medium;
A hearing protection device comprising (a) at least one sound barrier comprising at least one substantially periodic array of structures disposed in a first medium having a first density, said structures being made of a second medium having a second density different from said first density, wherein one of said first and second media is a viscoelastic medium having a speed of propagation of longitudinal sound wave and a speed of propagation of transverse sound wave, said speed of propagation of longitudinal sound wave being at least about 30 times said speed of propagation of transverse sound wave, and wherein the other of said first and second media is a viscoelastic or elastic medium;
Dependencies are inferred from the claim text.