Granted Patent
Utility
US 5,135,692 · App. 07/698,991
Form for patterned concrete
Inventor:
Franco L. Serafini
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: May 14, 1991
Inventor
Franco L. Serafini
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.