Granted Patent
Utility
US 5,115,728 · App. 07/589,931
System for controlling the differential pressure of a room having laboratory fume hoods
Inventors:
Osman Ahmed, Steven A. Bradley
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Sep 28, 1990
Inventors
Osman Ahmed
Steven A. Bradley
Assignee (at issue)
Landis & Gyr Powers, 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.