Granted Patent
Utility
US 5,308,558 · App. 08/106,469
Process for foaming thermoplastic polycarbonates
Inventors:
Edwin Woldenberg, Klaus Kircher, Klaus Horn, Johann Piontek, Burkhard Kohler, Wolfgang Ebert
Patented Case
View Patent ↗
Granted: May 3, 1994
Filed: Aug 13, 1993
Inventors
Edwin Woldenberg
Klaus Kircher
Klaus Horn
Johann Piontek
Burkhard Kohler
Wolfgang Ebert
Assignee (at issue)
Bayer Aktiengesellschaft
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.