Granted Patent
Utility
US 6,562,457 · App. 10/016,195
Polyether ester elastomer comprising polytrimethylene ether ester soft segment and tetramethylene ester hard segment
Inventors:
Marc B. Goldfinger, Hari Babu Sunkara
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: Oct 31, 2001
Inventors
Marc B. Goldfinger
Hari Babu Sunkara
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.