Granted Patent
Utility
US 4,756,702 · App. 06/948,212
Pretreatment process for flat tension mask
Inventor:
Johann Steiner
Patented Case
View Patent ↗
Granted: Jul 12, 1988
Filed: Dec 31, 1986
Inventor
Johann Steiner
Assignee (at issue)
Zenith Electronics 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.