Granted Patent
Utility
US 4,466,237 · App. 06/431,990
Mixed fiber length yarn
Inventor:
Linda C. Sawyer
Patented Case
View Patent ↗
Granted: Aug 21, 1984
Filed: Sep 30, 1982
Inventor
Linda C. Sawyer
Assignee (at issue)
Celanese GmbH
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.