Granted Patent
Utility
US 4,402,899 · App. 06/283,069
Zinc-free preparation of rayon fibers
Inventors:
Peter Hartmann, Albin F. Turbak
Patented Case
View Patent ↗
Granted: Sep 6, 1983
Filed: Jul 13, 1981
Inventors
Peter Hartmann
Albin F. Turbak
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.