Granted Patent
Utility
US 4,948,906 · App. 07/480,964
Trimethylaluminum process
Inventor:
William R. Beard
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: Feb 16, 1990
Inventor
William R. Beard
Assignee (at issue)
Ethyl 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.