Earplugs
AssigneeCabot Corporation
InventorRoss Gardner, Jr.
Life of this patent
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Abstract
There are disclosed earplugs composed of certain polymeric foam materials. The earplugs are of generally cylindrical shape and of somewhat larger diameter than the human ear canal. The earplugs are composed of a foamed plasticized polymeric material having a sufficiently high concentration of plasticizer to provide the earplug with a reduced rate of recovery from compression.
Claims19
An earplug of generally cylindrical shape having a diameter of between 3/8 and 3/4 inch, a length [to] of between 1/2 and 1 inch and composed of a resilient plasticised polymeric foam having a sufficiently high concentration of organic plasticizer therein as to provide said foam with a rate of recovery [of] from 60 percent compression thereof to 40 percent compression thereof of from 1 to 60 seconds and an equilibrium pressure [of] at 40 percent compression thereof of from 0.2 to 1.3 p.s.i.
An earplug having a size and shape adapted to be compressed and inserted into the human ear canal and there allowed to expand and obturate the ear canal, said earplug comprising a resilient plasticized polymeric foam having a sufficiently high concentration of organic plasticizer therein as to provide said foam with a rate of recovery from 60 percent compression thereof to 40 percent compression thereof of from 1 to 60 seconds and an equilibrium pressure at 40 percent compression thereof of from 0.2 to 1.3 p.s.i.
Dependencies are inferred from the claim text.