Title:
HEARING PROTECTIVE DEVICE WITH MOISTURE RESISTANT EARMUFF SOUND ABSORBERS
Document Type and Number:
WIPO Patent Application WO/2011/115825
Kind Code:
A3
Abstract:
An earmuff hearing protective device whose earmuffs each include a generally cup-shaped, substantially rigid shell having a head-facing rim; a head-engaging, ear-encircling cushion affixed to the rim; and a sound absorber inside the shell. The sound absorber has a moisture-resistant integral skin substantially surrounding an open cell foam interior having lower density and greater porosity than that of the skin. The skin helps discourage moisture pickup and microbial growth.
Inventors:
FERNANDES RAFAEL P (BR)
RIBEIRO ELEM CRISTINA CARLOS (BR)
MAZZA RODRIGO H (BR)
DE GOUVEA EMILIO C P (BR)
RIBEIRO ELEM CRISTINA CARLOS (BR)
MAZZA RODRIGO H (BR)
DE GOUVEA EMILIO C P (BR)
Application Number:
PCT/US2011/028036
Publication Date:
January 05, 2012
Filing Date:
March 11, 2011
Export Citation:
Assignee:
3M INNOVATIVE PROPERTIES CO (US)
International Classes:
A42B3/16; A61F11/14
Foreign References:
| US5979451A | 1999-11-09 | |||
| US5970160A | 1999-10-19 | |||
| US20070044205A1 | 2007-03-01 | |||
| US20080235853A1 | 2008-10-02 |
Other References:
See also references of EP 2547300A4
Attorney, Agent or Firm:
HANSON, Karl, G., et al. (Office of Intellectual Property CounselPost Office Box 3342, Saint Paul MN, US)
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