Granted Patent
Utility
US 4,251,185 · App. 05/902,016
Expansion control ring for a turbine shroud assembly
Inventor:
Karl W. Karstensen
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: May 1, 1978
Inventor
Karl W. Karstensen
Assignee (at issue)
Caterpillar Tractor Co.
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.