Granted Patent
Utility
US 4,256,111 · App. 05/402,311
Filaments of chemically modified cellulose fibers and webs and products formed therefrom
Inventor:
Frederick O. Lassen
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Oct 1, 1973
Inventor
Frederick O. Lassen
Assignee (at issue)
Kimberly-Clark 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.