Granted Patent
Utility
US 4,388,349 · App. 06/402,768
Extrusion coating process
Inventors:
Ralf Korpman, C. Palermo Felice
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: Jul 28, 1982
Inventors
Ralf Korpman
C. Palermo Felice
Assignee (at issue)
Permacel
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.