Granted Patent
Utility
US 6,231,942 · App. 09/010,289
Method and apparatus for microcellular polypropylene extrusion, and polypropylene articles produced thereby
Inventors:
Kent Blizard, Srinath Tupil, William Malavich
Patented Case
View Patent ↗
Granted: May 15, 2001
Filed: Jan 21, 1998
Inventors
Kent Blizard
Srinath Tupil
William Malavich
Assignee (at issue)
Trexel, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.