Granted Patent
Utility
US 5,969,015 · App. 08/929,150
Monomeric and oligomeric bisphosphites as stabilisers for polyvinyl chloride
Inventors:
Horst Zinke, Karl-Josef Kuhn, Wolfgang Wehner
Patented Case
View Patent ↗
Granted: Oct 19, 1999
Filed: Sep 10, 1997
Inventors
Horst Zinke
Karl-Josef Kuhn
Wolfgang Wehner
Assignee (at issue)
Witco Vinyl Additives 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.