Granted Patent
Utility
US 6,609,986 · App. 09/439,318
Mechanical tensioner comprised of a rigid arm urged against chain by at least one blade type spring
Inventor:
Mark M. Wigsten
Patented Case
View Patent ↗
Granted: Aug 26, 2003
Filed: Nov 12, 1999
Inventor
Mark M. Wigsten
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.