公开(公告)号：USD895901S1

公开(公告)日：2020-09-08

申请号：US29616041

申请日：2017-09-01

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Designer： Robert C. Coffin ,  Matthew V. Stonebraker, Jr. ,  Jacob H. Ely ,  Ravi Thomas

公开(公告)号：US11304851B2

公开(公告)日：2022-04-19

申请号：US16643080

申请日：2018-08-30

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Robert C. Coffin ,  Matthew V. Stonebraker, Jr. ,  Jacob H. Ely ,  Jeff L. Hamer ,  Kenneth F. Teeters ,  Ravi Thomas

IPC: A61F11/08

Abstract: An earplug comprises a core and a sound-attenuating body attached to the core, the sound-attenuating body comprising a tip cavity extending proximally from the tip of the sound-attenuating body and comprising a distal opening. The tip cavity side wall includes a plurality of protrusions extending inwardly toward the longitudinal axis of the core. The plurality of protrusions may include from 2 to 12 protrusions. A method of making an earplug includes covering at least a portion of a core with a material including unactivated foaming agent; inserting an end of the core and at least a portion of the material into a mold cavity; and activating the foaming agent to create a sound-attenuating body. The sound-attenuating body has a base, tip, and tip cavity with a plurality of protrusions. The mold cavity may include a boss with a cup and plurality of cut-outs on the cup for forming the protrusions.

公开(公告)号：USD889754S1

公开(公告)日：2020-07-07

申请号：US29721057

申请日：2020-01-17

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Designer： Robert C. Coffin ,  Matthew V. Stonebraker, Jr. ,  Jacob H. Ely ,  Ravi Thomas