Granted Patent
Utility
US 3,975,488 · App. 05/462,272
Process for preparing poly(tetramethylene terephthalate) yarn
Inventor:
Joseph Patterson
Patented Case
View Patent ↗
Granted: Aug 17, 1976
Filed: Apr 19, 1974
Inventor
Joseph Patterson
Assignee (at issue)
Fiber Industries, 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.