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US 5,557,077 AGranted
Hearing-protector plug
AssigneeBilsom AB
InventorBengt G. Berg
Life of this patent
Estimating the term…
Abstract
Hearing-protector plug made of plug material in which there is distributed a detectable material in powder form, particularly iron powder. If lost, such as in the food industry, the plug can be traced with the aid of detection equipment.
Claims15
Hearing-protector plug adapted to be applied in the ear, comprising:
- a plug material;
- and
- means for enabling tracing of said plug material with detection equipment operating magnetically, said means for enabling tracing comprising a powder distributed in said plug material, the particle size of the powder being up to about 300 .mu.m.
Hearing-protector plug adapted to be applied to the ear, comprising:
- a plug material comprising glass fibers;
- and
- means for enabling tracing of said plug material with detection equipment, said means for enabling tracing comprising a powder being distributed in said plug material in finely-divided particulate form.
Dependencies are inferred from the claim text.