Granted Patent
Utility
US 5,644,299 · App. 08/255,390
Ultrasonic material level measurement
Inventor:
William T. Cruickshank
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Jun 8, 1994
Inventor
William T. Cruickshank
Assignee (at issue)
Bindicator Company
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.