Granted Patent
Utility
US 6,586,566 · App. 09/890,995
Double metal cyanide catalysts for producing polyether polyols
Inventors:
Jörg Hofmann, Pieter Ooms, Pramod Gupta, Walter Schafer, John Lohrenz
Patented Case
View Patent ↗
Granted: Jul 1, 2003
Filed: Aug 8, 2001
Inventors
Jörg Hofmann
Pieter Ooms
Pramod Gupta
Walter Schafer
John Lohrenz
Assignee (at issue)
Bayer Aktiengesellschaft
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.