Granted Patent
Utility
US 4,265,849 · App. 06/043,072
Method for producing multifilament thermoplastic yarn having latent crimp
Inventor:
David E. Borenstein
Patented Case
View Patent ↗
Granted: May 5, 1981
Filed: May 29, 1979
Inventor
David E. Borenstein
Assignee (at issue)
Phillips Petroleum 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.