Eartip
AssigneeSperian Hearing Protection, LLC
InventorsStephen D. Gilder, David B. Mulvey
Life of this patent
Estimating the term…
Abstract
An improved EarTip may result from the distribution of PTFE throughout a slow recovery foam. Such an EarTip may have a finer, more uniform cell structure that aids in insertion within a user's ear canal. It may also have a smoother skin, with a lower kinetic coefficient of friction, and may provide improved sound attenuation.
Claims23
An EarTip comprising:
- a main body portion constructed to enable its reception in an ear canal;
- wherein:
- the main body is formed of pressure-molded slow recovery low resilient foam plastic material comprising multiple gas-filled open cells and having a low coefficient of friction additive distributed throughout the foam material.
An EarTip comprising a main body portion constructed to enable its reception in an ear canal, wherein:
- the main body is formed of slow recovery low resilient foam plastic material comprising multiple open cells and having low coefficient of friction additive distributed throughout;
- the average diameter of the cells is smaller than that of standard slow recovery low resilient foam plastic without additive;
- and
- the main body has a cross-section, wherein the average diameter of the cells does not vary across the cross-section as much as for standard slow recovery low resilient foam plastic without additive.
An EarTip comprising a main body portion constructed to enable its reception in an ear canal, wherein:
- the main body portion is formed of slow recovery foam;
- the main body portion has an average static coefficient of friction greater than that of standard slow recovery foam;
- and
- the main body portion has an average kinetic coefficient of friction less than that of standard slow recovery foam.
A foam material formed of pressure-molded slow recovery low resilient foam plastic material comprising multiple gas-filled open cells and having low coefficient of friction additive approximately uniformly distributed throughout the foam material.
Dependencies are inferred from the claim text.