Granted Patent
Utility
US 4,589,616 · App. 06/573,446
Cruise airspeed control of aircraft altitude capture
Inventor:
Terry L. Zweifel
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Jan 24, 1984
Inventor
Terry L. Zweifel
Assignee (at issue)
Sperry Corp.
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.