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:
Nov. 20, 2012
Filed:
Oct. 08, 2010
Matteo Bianchi, Bristol, GB;
Fabrizio Scarpa, Bristol, GB;
Matteo Bianchi, Bristol, GB;
Fabrizio Scarpa, Bristol, GB;
Rolls-Royce PLC, London, GB;
Abstract
A method of manufacturing a foam having a negative Poisson's ratio comprising the steps: placing a padof open cell polyurethane foam on a moulding surface; placing a flexible membraneover the exposed surface of the foam to create a sealed chamberbetween the moulding surfaceand the flexible membranein which the foam padis disposed; applying an isostatic pressure difference between the inside and the outside of the chamberthereby collapsing the foam padbetween the flexible membraneand the moulding surface; heating the foam padto a predetermined temperature, and subsequently cooling the foam padwhile collapsed.