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:
Sep. 08, 2009
Filed:
Feb. 17, 2004
Peter T. Aylward, Hilton, NY (US);
Narasimharao Dontula, Rochester, NY (US);
Terry A. Heath, Caledonia, NY (US);
Richard D. Bomba, Rochester, NY (US);
John E. Benson, Webster, NY (US);
Peter T. Aylward, Hilton, NY (US);
Narasimharao Dontula, Rochester, NY (US);
Terry A. Heath, Caledonia, NY (US);
Richard D. Bomba, Rochester, NY (US);
John E. Benson, Webster, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
The invention relates to a base comprising a closed cell foam core sheet having a closed cell foam layer with a density gradient between the center of the core and the surfaces of the core. The invention also relates to a method of making such a base by adding a first concentration of a first blowing agent to a first polymer to form a first mixture, adding a second concentration of a second blowing agent to a second polymer to form a second mixture, and extruding the mixtures to form the closed cell foam core sheet. The invention also relates to a method of making such a closed cell foam core sheet base comprising the steps of adding a blowing agent to a polymer to form a mixture, melting the mixture, extruding the mixture from a die, and rapidly quenching the mixture against a high heat transfer surface.