Granted Patent
Utility
US 6,156,934 · App. 08/987,555
Diphosphines
Inventors:
Jacoba Catherina Lucia Johanna Suykerbuyk, Eit Drent, Paul Gerard Pringle
Patented Case
View Patent ↗
Granted: Dec 5, 2000
Filed: Dec 9, 1997
Inventors
Jacoba Catherina Lucia Johanna Suykerbuyk
Eit Drent
Paul Gerard Pringle
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.