Granted Patent
Utility
US 5,334,669 · App. 07/952,619
Process for the production of high molecular weight polyester resins
Inventor:
Guido Ghisolfi
Patented Case
View Patent ↗
Granted: Aug 2, 1994
Filed: Nov 25, 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.