Granted Patent
Utility
US 5,921,502 · App. 08/665,914
Hybrid ice-protection system for use on roughness-sensitive airfoils
Inventors:
Kamel Al-Khalil, Thomas F. W. Ferguson, Dennis M. Phillips
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: Jun 19, 1996
Inventors
Kamel Al-Khalil
Thomas F. W. Ferguson
Dennis M. Phillips
Assignee (at issue)
Cox & Company, 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.