Granted Patent
Utility
US 4,821,287 · App. 07/111,775
Apparatus and method for detecting digital carrier synchronization problems
Inventor:
Francis P. Keiper, Jr.
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Oct 21, 1987
Inventor
Francis P. Keiper, Jr.
Assignee (at issue)
F. L. Jennings
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.