Granted Patent
Utility
US 6,324,487 · App. 09/645,770
System and method for determining instantaneous rotation frequency
Inventors:
Shie Qian, Hui Shao, Wei Jin
Patented Case
View Patent ↗
Granted: Nov 27, 2001
Filed: Aug 24, 2000
Inventors
Shie Qian
Hui Shao
Wei Jin
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.