Granted Patent
Utility
US 4,674,999 · App. 06/735,655
Method of forming a plastic film construction
Inventor:
Michael A. Francis
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: May 20, 1985
Inventor
Michael A. Francis
Assignee (at issue)
Ethyl 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.