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 Title: |
US4668557:
Polyhedron cell structure and method of making same
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Lakes, Roderic S.; Iowa City, IA
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| Assignee: |
The University of Iowa Research Foundation, Iowa City, IA
other patents from UNIVERSITY OF IOWA RESEARCH FOUNDATION (599605) (approx. 320)
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| Published / Filed: |
1987-05-26
/ 1986-07-18
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| Application Number: |
US1986000886833
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| IPC Code: |
Advanced:
B29C 44/56;
B29C 67/20;
C08J 9/36;
Core:
B29C 44/34;
C08J 9/00;
more...
IPC-7:
B32B 3/10;
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| U.S. Class: |
Current:
428/131;
264/321;
428/311.11;
428/312.8;
428/314.2;
521/918;
Original:
428/131;
264/321;
428/311.1;
428/312.8;
428/314.2;
521/918;
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| Field of Search: |
264/321
428/131,304.4,310.5,311.1,311.5,312.2,312.8,314.2
521/918
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| Priority Number: |
| 1986-07-18 |
US1986000886833 |
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| 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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| Attorney, Agent or Firm: |
Nemmers, James C. ;
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| Primary / Asst. Examiners: |
Van Balen, William J.;
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| INPADOC Legal Status: |
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| Family: |
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First Claim:
Show all 7 claims |
What is claimed is:
1. The method of making a composition of matter having a negative Poisson's ratio comprising the steps of producing a starting material having an open-cell foam structure with each cell being defined by a plurality of ribs; applying sufficient force to the starting material in each of three orthogonal directions simultaneously to compress the ribs of the cells inwardly; raising the temperature of the material above the softening temperature of the material while maintaining the material in the compressed state; cooling the material below the softening temperature while continuing to maintain the material in the compressed state: and releasing the applied force once the material has cooled below the softening temperature.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 24 U.S. patent(s) that reference this one
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