Granted Patent
Utility
US 4,867,639 · App. 07/099,810
Abradable shroud coating
Inventor:
Thomas E. Strangman
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Sep 22, 1987
Inventor
Thomas E. Strangman
Assignee (at issue)
AlliedSignal, Inc.
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.