Granted Patent
Utility
US 4,494,538 · App. 06/482,622
Mask assembly
Inventor:
William K. Ansite
Patented Case
View Patent ↗
Granted: Jan 22, 1985
Filed: Apr 6, 1983
Inventor
William K. Ansite
Assignee (at issue)
Figgie Inernational 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.