Paired earplug construction
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United States of America Patent
Stats
-
Mar 18, 1980
Grant Date -
N/A
app pub date -
Apr 28, 1978
filing date -
Apr 28, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed herein is a tethered earplug construction comprising a pair of plasticized thermoplastic foam earplugs tethered together by one or more flexible plasticized thermoplastic cord elements. Attachment of the cord element to the earplug is achieved by ultrasonic welding.
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