Granted Patent
Utility
US 4,867,757 · App. 07/242,231
Lapping slurry compositions with improved lap rate
Inventor:
Charles C. Payne
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Sep 9, 1988
Inventor
Charles C. Payne
Assignee (at issue)
Nalco Chemical Company
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.