Granted Patent
Utility
US 6,576,340 · App. 09/708,209
Acid dyeable polyester compositions
Inventors:
Yanhui Sun, Jun Zhao
Patented Case
View Patent ↗
Granted: Jun 10, 2003
Filed: Nov 8, 2000
Inventors
Yanhui Sun
Jun Zhao
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND 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.