Granted Patent
Utility
US 6,720,459 · App. 09/738,689
Continuous process for the preparation of polytrimethylene ether glycol
Inventors:
Hari Babu Sunkara, Ernest Keith Marchildon, Howard Ng, Leo Ernest Manzer
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Dec 15, 2000
Inventors
Hari Babu Sunkara
Ernest Keith Marchildon
Howard Ng
Leo Ernest Manzer
Assignee (at issue)
E I DU PONT 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.