Granted Patent
Utility
US 5,186,790 · App. 07/611,780
Chemical milling of aluminum-lithium alloys
Inventor:
John H. Powers
Patented Case
View Patent ↗
Granted: Feb 16, 1993
Filed: Nov 13, 1990
Inventor
John H. Powers
Assignee (at issue)
Aluminum Company of America
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.