Granted Patent
Utility
US 4,644,749 · App. 06/476,943
Phase locked looped controller for motordrivers
Inventor:
Richard K. Somes
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Mar 21, 1983
Inventor
Richard K. Somes
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.