Granted Patent
Utility
US 4,748,101 · App. 06/927,191
Overlay proofing film
Inventor:
O. Alfred Barton
Patented Case
View Patent ↗
Granted: May 31, 1988
Filed: Nov 4, 1986
Inventor
O. Alfred Barton
Assignee (at issue)
Hoechst Celanese Corporation
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.