Granted Patent
Utility
US 5,573,820 · App. 08/364,092
Process for preparing polyester
Inventors:
Hirofumi Harazoe, Masayuki Sakai
Patented Case
View Patent ↗
Granted: Nov 12, 1996
Filed: Dec 27, 1994
Inventors
Hirofumi Harazoe
Masayuki Sakai
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.