RTH has developed new types of custom molded earplugs including fabrication techniques. One utility patent is pending, while the other has issued. RTH has also developed novel techniques for creating earplugs that are held as company secrets.
Click on the images to see the title page of patents (when available). Click on the links below to download full patents (when available).
Concha fitting custom earplug with flexible skin and filler material
Custom molded earplug with special skin and filler material.