Granted Patent
Utility
US 4,987,387 · App. 07/404,793
Phase locked loop circuit with digital control
Inventors:
Richard A. Kennedy, Seyed R. Zarabadi, Stephen L. Inman, Martin Gravenstein
Patented Case
View Patent ↗
Granted: Jan 22, 1991
Filed: Sep 8, 1989
Inventors
Richard A. Kennedy
Seyed R. Zarabadi
Stephen L. Inman
Martin Gravenstein
Assignee (at issue)
DELCO ELECTRONICS CORPORATION
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.