Granted Patent
Utility
US 4,169,337 · App. 05/891,665
Process for polishing semi-conductor materials
Inventor:
Charles C. Payne
Patented Case
View Patent ↗
Granted: Oct 2, 1979
Filed: Mar 30, 1978
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.