US PATENT SUBCLASS 128 / 867
.~.~.~ With noise or pressure attenuating means (e.g., dampening, filtering, etc.)

Current as of: June, 1999
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128 /   HD   SURGERY

846  DF  BODY PROTECTING OR RESTRAINING DEVICES FOR PATIENTS OR INFANTS (E.G., SHIELDS, IMMOBILIZERS) {8}
857  DF  .~ Head or face protector (e.g., lips, ears, etc.) {4}
864  DF  .~.~ Aural protectors (e.g., ear) {3}
867.~.~.~ With noise or pressure attenuating means (e.g., dampening, filtering, etc.) {1}
868  DF  .~.~.~.~> Valve means (e.g., diaphragm)

DEFINITION

Classification: 128/867

With noise or pressure attenuating means (e.g., dampening, filtering, etc.):

(under subclass 864) Subject matter including an ear protector having means to prevent injurious sound or a force of air waves from damaging the organ of hearing or means for normalizing pressure within said organ of hearing (e.g., ear cavity).

(1) Note. The means here usually includes noise dampening devices and filters.