Granted Patent
Utility
US 5,338,808 · App. 07/952,884
Process for the production of high molecular weight polyester resins
Inventor:
Guido Ghisolfi
Patented Case
View Patent ↗
Granted: Aug 16, 1994
Filed: Dec 28, 1992
Inventor
Guido Ghisolfi
Assignee (at issue)
M. & G. Richerche S.p.A.
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.