Granted Patent
Utility
US 4,886,511 · App. 07/210,610
Corrugated disposable diaper
Inventor:
Ralf Korpman
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Jun 23, 1988
Inventor
Ralf Korpman
Assignee (at issue)
Personal Products 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.