Granted Patent
Utility
US 4,247,247 · App. 06/042,979
Blade tip clearance control
Inventor:
Glenn W. Thebert
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: May 29, 1979
Inventor
Glenn W. Thebert
Assignee (at issue)
General Motors LLC
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.