Granted Patent
Utility
US 4,405,549 · App. 06/283,070
Zinc-free preparation of rayon fibers
Inventors:
Albin F. Turbak, Peter Hartmann
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: Jul 13, 1981
Inventors
Albin F. Turbak
Peter Hartmann
Assignee (at issue)
International Telephone and Telegraph Corporation
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.