Granted Patent
Utility
US 4,408,957 · App. 05/227,795
Supersonic blading
Inventors:
John W. Kurzrock, Peter C. Tramm
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Feb 22, 1972
Inventors
John W. Kurzrock
Peter C. Tramm
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.