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:
Apr. 26, 2005
Filed:
Jul. 27, 2000
Theodore A. Burnham, Winchester, MA (US);
Sung W. Cha, Roxbury, MA (US);
Robert H. Walat, Boston, MA (US);
Roland Y. Kim, Somerville, MA (US);
Jere R. Anderson, Newburyport, MA (US);
James F. Stevenson, Morristown, NJ (US);
Nam P. Suh, Sudbury, MA (US);
Matthew Pallaver, Lexington, MA (US);
Theodore A. Burnham, Winchester, MA (US);
Sung W. Cha, Roxbury, MA (US);
Robert H. Walat, Boston, MA (US);
Roland Y. Kim, Somerville, MA (US);
Jere R. Anderson, Newburyport, MA (US);
James F. Stevenson, Morristown, NJ (US);
Nam P. Suh, Sudbury, MA (US);
Matthew Pallaver, Lexington, MA (US);
Trexel, Inc., Woburn, MA (US);
Abstract
Continuous polymeric extrusion nucleation systems and methods useful for making polymeric microcellular foamed materials, including crystalline and semi-crystalline polymeric microcellular materials, are provided. Pressure drop rate is an important feature in some embodiments, and the invention provides systems for controlling these and other parameters. One aspect involves a multiple-pathway nucleator that is separated from a shaping die by a residence chamber. Another aspect involves a die for making advantageously thick articles, including a multiple-pathway nucleation section. Microcellular material can be continuously extruded onto wire, resulting in a very thin, essentially closed-cell microcellular insulating coating secured to a wire. Other very thin microcellular products can be fabricated as well.