Patent · US Active

Foam ear plug or earpiece utilizing recycled pulverized polyurethane foam

US7985468B1 · kind B1 · utility

1Cited by

2References

6Claims

0Family size

Assignee

Sperlan Hearing Protection, LLC · US

Inventors

Stephen D. Gilder · Chula Vista, US
Jim Tiemens · Laguna Niguel, US
Larry Sanders · Ogden, US

Key dates

Filing date	Jul 30, 2008
Grant date	Jul 26, 2011
Priority date	—
Expiry date	Jan 15, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/249986
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

An earpiece of flexible foam construction which incorporates recycled pulverized polyurethane foam (RPPF). RPPF constituting 5% to 30% of the improved foam has been found to be useful. The novel and unique nature of RPPF allows for the replacement of a higher cost component with a lower cost component while maintaining or improving physical properties, such as sound attenuation, sound control, comfort and fit.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.