Granted Patent
Utility
US 5,513,531 · App. 08/114,162
Ultrasonic system for measurement of thin layers
Inventors:
Mark A. Sapia, David S. Leonard
Patented Case
View Patent ↗
Granted: May 7, 1996
Filed: Sep 1, 1993
Inventors
Mark A. Sapia
David S. Leonard
Assignee (at issue)
Combustion Engineering, 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.