Inventor

Roderic S. Lakes

Document Type

Patent

Patent Number

US Patent 4,668,557

Patent agency

United States Patent and Trademark Office

Publication Date

5-26-1987

Assignee

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

Application Number

06/886,833

Date Filed

1986-07-18

Total Pages

5 pages

Abstract

An open cell foam structure that has a negative Poisson's ratio. Structure can be created by triaxially compressing a conventional open-cell foam material and heating the compressed structure beyond the softening point to produce a permanent deformation in the structure of the material. The structure thus produced has cells whose ribs protrude into the cell resulting in unique properties for materials of this type.

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URL

https://ir.uiowa.edu/patents/53