Granted Patent
Utility
US 4,925,587 · App. 07/219,423
Hydroxy ethers, a process for their production, and methods for their use
Inventors:
Gilbert Schenker, Robert Piorr, Sabine Luettge
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Jul 14, 1988
Inventors
Gilbert Schenker
Robert Piorr
Sabine Luettge
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien
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.