Inventor

Edwin Norbeck

Document Type

Patent

Patent Number

US Patent 4,114,500

Patent agency

United States Patent and Trademark Office

Publication Date

9-19-1978

Assignee

University of Iowa Research Foundation (Iowa City, IA, US)

Application Number

05/688,503

Date Filed

1976-05-20

Total Pages

4 pages

Abstract

A pad for closing the tone hole of a woodwind instrument is formed of a disc of silicone rubber having a compression set at room temperature after 22 hours no greater than about 5%.The edge surfaces of the disc are tapered, and a backing disc of sheet material is provided to facilitate installation of the elastomer disc in many instruments.

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URL

https://ir.uiowa.edu/patents/12