The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2007
Filed:
Dec. 21, 2004
Applicants:
Kim Lesley Alderson, Liverpool, GB;
Virginia Ruth Simkins, Lancashire, GB;
Inventors:
Kim Lesley Alderson, Liverpool, GB;
Virginia Ruth Simkins, Lancashire, GB;
Assignee:
Auxetic Technologies Ltd., Bolton, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C 67/00 (2006.01); B27N 3/00 (2006.01); D04H 1/54 (2006.01); B32B 27/00 (2006.01); B28D 22/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An auxetic material, which has a negative Poisson ratio so that it has the property of expanding or contracting transversely to a direction in which it is extended or compressed, is made in filamentary or fibrous form. A suitable process involves cohering and extruding heated polymer powder so that the cohesion and extrusion is effected with spinning to produce auxetic filaments. Typically the powder is heated to a temperature sufficient to allow some degree of surface melting yet not high enough to enable bulk melting.