Granted Patent
Utility
US 6,716,788 · App. 10/457,988
Preparation of a double metal cyanide catalyst
Inventors:
Michiel Barend Eleveld, Robert Adrianus Wilhelmus Grotenbreg, Ronald Van Kempen
Patented Case
View Patent ↗
Granted: Apr 6, 2004
Filed: Jun 10, 2003
Inventors
Michiel Barend Eleveld
Robert Adrianus Wilhelmus Grotenbreg
Ronald Van Kempen
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.