Granted Patent
Utility
US 4,253,299 · App. 06/035,586
Bulked and entangled multifilament thermoplastic yarn
Inventors:
David E. Borenstein, Jack A. Banning
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: May 3, 1979
Inventors
David E. Borenstein
Jack A. Banning
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.