Granted Patent
Utility
US 5,389,708 · App. 08/009,761
Sulfur-containing acid phosphoric ester internal release agent
Inventors:
Masahiko Kusumoto, Hiroyuki Yamashita, Teruyuki Nagata
Patented Case
View Patent ↗
Granted: Feb 14, 1995
Filed: Jan 27, 1993
Inventors
Masahiko Kusumoto
Hiroyuki Yamashita
Teruyuki Nagata
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.