Granted Patent
Utility
US 5,643,413 · App. 08/663,556
Multi-ply paper product and method of making the same
Inventor:
Roger P. Hoffman
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Jun 13, 1996
Inventor
Roger P. Hoffman
Assignee (at issue)
Hoffman Environmental System, 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.