Granted Patent
Utility
US 4,451,262 · App. 06/338,724
After-treatment of finished, cellulose-containing fibrous materials with liquid ammonia
Inventors:
Fritz Mayer, Svein Holtermann
Patented Case
View Patent ↗
Granted: May 29, 1984
Filed: Jan 11, 1982
Inventors
Fritz Mayer
Svein Holtermann
Assignee (at issue)
Ciba-Geigy
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.