3m Innovative Properties Company

David M Lutgring

Michael J Pescetto

Paul D Henry

Ravi Thomas

James D Brown

Mark A Yoder

David A Hotvet

Water resistant acoustic ports and electronic hearing protection devices incorporating such ports are described. More specifically, water proof acoustic ports that provide water protection for an internal sealed chamber by providing acoustically transparent inlets that are capable of withstanding external water pressure at given depth due to their volume relation to that of the internal chamber, as well as hearing protection devices incorporating such ports, are described.

Water resistant acoustic port in ear-mouthed hearing device

Portable charging storage case

A switch system having a user-activatable button and button travel limit feature is disclosed. The switch system includes a housing comprising an opening, a circuit board assembly positioned in the housing, and an electrical switch assembly connected to the circuit board. The button travel limit feature is adapted to inhibit motion of an activation surface of the user-activatable button towards the electrical switch assembly when the electrical switch assembly is activated.

Switch system having a button travel limit feature

Ear bud body shape

Ear bud shaft and taper

Growing community of inventors

Indianapolis, IN, United States of America

David M Lutgring