Granted Patent
Utility
US 5,326,381 · App. 08/060,079
Use of polytetrafluoroethylene resin particles to reduce the abrasion of abrasive pigments
Inventor:
Joseph H. Z. Wu
Patented Case
View Patent ↗
Granted: Jul 5, 1994
Filed: May 10, 1993
Inventor
Joseph H. Z. Wu
Assignee (at issue)
Engelhard 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.