Granted Patent
Utility
US 5,718,821 · App. 08/821,284
Copolymers of ethylenically unsaturated carboxylic acid esters with polyoxyalkylene ethers of lower, unsaturated alcohols as flow-improving agents for paraffin containing oils
Inventors:
Matthias Krull, Sigmar-Peter von Halasz, Werner Reimann, Juliane Balzer, Horst Geiss
Patented Case
View Patent ↗
Granted: Feb 17, 1998
Filed: Mar 20, 1997
Inventors
Matthias Krull
Sigmar-Peter von Halasz
Werner Reimann
Juliane Balzer
Horst Geiss
Assignee (at issue)
Hoechst GmbH
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.