Granted Patent
Utility
US 4,893,068 · App. 07/271,477
Digital servo employing switch mode lead/lag integrator
Inventor:
Daniel D. Evans
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Nov 15, 1988
Inventor
Daniel D. Evans
Assignee (at issue)
Hughes Aircraft Company
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.