Granted Patent
Utility
US 5,750,055 · App. 08/491,017
Process for the preparation of industrially applicable difunctional anionic polymerization initiators and their use
Inventors:
Frederik Hendrik Van Der Steen, Judith Johanna Berendina Walhof
Patented Case
View Patent ↗
Granted: May 12, 1998
Filed: Jun 15, 1995
Inventors
Frederik Hendrik Van Der Steen
Judith Johanna Berendina Walhof
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.