Cold-drawn polyolefin copolymers cord for earplug
US11076995B2 · kind B2 · utility
0Cited by
23References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2018 |
| Grant date | Aug 3, 2021 |
| Priority date | — |
| Expiry date | Aug 30, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/768
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An earplug assembly and method of forming the same is described. The method includes uniaxially stretching a cord formed of copolymer including ethylene segments and vinyl acetate segments to form a cold-drawn cord. The cold drawn cord has an elongation to break of 250% or less. The method then includes fixing the cold drawn cord to an earplug.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.