Granted Patent
Utility
US 4,856,562 · App. 06/357,014
Papermakers wet felts
Inventor:
Marcel Dufour
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Mar 11, 1982
Inventor
Marcel Dufour
Assignee (at issue)
Asten, 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.