Granted Patent
Utility
US 4,251,272 · App. 05/973,437
Oxidation resistant porous abradable seal member for high temperature service
Inventor:
Raymond V. Sara
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Dec 26, 1978
Inventor
Raymond V. Sara
Assignee (at issue)
Union Carbide 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.