Granted Patent
Utility
US 4,357,290 · App. 06/186,879
Splittable conjugate yarn
Inventor:
Jing-peir Yu
Patented Case
View Patent ↗
Granted: Nov 2, 1982
Filed: Sep 12, 1980
Inventor
Jing-peir Yu
Assignee (at issue)
Monsanto Company
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.