Granted Patent
Utility
US 6,113,997 · App. 09/316,347
Process to prepare a polyester resin
Inventors:
Freddie L. Massey, Deborah Tung, Millicent Louise Martin-Shultz, Ben Duh, Charles L. Kern
Patented Case
View Patent ↗
Granted: Sep 5, 2000
Filed: May 21, 1999
Inventors
Freddie L. Massey
Deborah Tung
Millicent Louise Martin-Shultz
Ben Duh
Charles L. Kern
Assignee (at issue)
SHELL OIL 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.