Granted Patent
Utility
US 6,569,981 · App. 10/030,489
Crystallizing polyether polyols, a method for producing them and use of the same
Inventors:
Walter Schafer, Jörg Hofmann, Pramod Gupta, Pieter Ooms
Patented Case
View Patent ↗
Granted: May 27, 2003
Filed: Oct 25, 2001
Inventors
Walter Schafer
Jörg Hofmann
Pramod Gupta
Pieter Ooms
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.