Granted Patent
Utility
US 5,247,827 · App. 07/868,552
Resistive measurement of airborne contaminants
Inventor:
Bharatbhai M. Shah
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Apr 14, 1992
Inventor
Bharatbhai M. Shah
Assignee (at issue)
Bell Communications Research, 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.