Granted Patent
Utility
US 4,891,473 · App. 07/354,717
High voltage insulators constructed to have plural dry bands in use
Inventor:
Olaf Nigol
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: May 22, 1989
Inventor
Olaf Nigol
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.