Granted Patent
Utility
US 4,299,865 · App. 06/173,030
Abradable ceramic seal and method of making same
Inventors:
David L. Clingman, John R. Cavanagh, Berton Schechter, Kenneth R. Cross
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Jul 28, 1980
Inventors
David L. Clingman
John R. Cavanagh
Berton Schechter
Kenneth R. Cross
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.