Granted Patent
Utility
US 4,520,449 · App. 06/399,538
Phase angle detector
Inventors:
Edwin A. Johnson, Chun K. Leung
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: Jul 19, 1982
Inventors
Edwin A. Johnson
Chun K. Leung
Assignee (at issue)
ALLIED CONSULTING, 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.