Granted Patent
Utility
US 4,674,609 · App. 06/740,443
Torsional vibration dampening system
Inventors:
Fred D. Sturges, Romas B. Spokas
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Jun 3, 1985
Inventors
Fred D. Sturges
Romas B. Spokas
Assignee (at issue)
BorgWarner 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.