Granted Patent
Utility
US 4,856,820 · App. 07/005,922
Coding system
Inventors:
Paul L. Kasprzak, Michael E. Moy
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Jan 21, 1987
Inventors
Paul L. Kasprzak
Michael E. Moy
Assignee (at issue)
WRIGHT LINE, LLC
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.