Granted Patent
Utility
US 4,453,378 · App. 06/369,494
Torsional mode suppressor
Inventors:
Raymond D. Zagranski, James J. Howlett
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Apr 19, 1982
Inventors
Raymond D. Zagranski
James J. Howlett
Assignee (at issue)
Chandler Evans Inc.
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.