Granted Patent
Utility
US 4,648,021 · App. 06/815,963
Frequency doubler circuit and method
Inventor:
Jade H. Alberkrack
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Jan 3, 1986
Inventor
Jade H. Alberkrack
Assignee (at issue)
Motorola, Inc.
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.