Granted Patent
Utility
US 4,753,698 · App. 06/919,849
Method for the production of spun bonded nonwoven fabrics having a uniform structure
Inventors:
Ludwig Hartmann, Gerhard Muller
Patented Case
View Patent ↗
Granted: Jun 28, 1988
Filed: Oct 16, 1986
Inventors
Ludwig Hartmann
Gerhard Muller
Assignee (at issue)
Firma Carl Freudenberg
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.