Granted Patent
Utility
US 4,925,880 · App. 07/389,291
Composition and process for making porous articles from ultra high molecular weight polyethylene
Inventor:
Harvey Lewis Stein
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Aug 3, 1989
Inventor
Harvey Lewis Stein
Assignee (at issue)
Hoechst Celanese Corporation
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.