Granted Patent
Utility
US 6,202,034 · App. 09/237,851
Ultrasonic ranging system and method for improving accuracy thereof
Inventor:
Songnian Li
Patented Case
View Patent ↗
Granted: Mar 13, 2001
Filed: Jan 27, 1999
Inventor
Songnian Li
Assignee (at issue)
Delphi Technologies
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.