Granted Patent
Utility
US 5,266,633 · App. 07/716,855
Toughened polyoxymethylene and shaped articles produced therefrom
Inventors:
Karlheinz Burg, Harald Cherdron, Friedrich Kloos, Helmut Schlaf
Patented Case
View Patent ↗
Granted: Nov 30, 1993
Filed: Jun 17, 1991
Inventors
Karlheinz Burg
Harald Cherdron
Friedrich Kloos
Helmut Schlaf
Assignee (at issue)
Hoechst GmbH
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.