Granted Patent
Utility
US 4,929,504 · App. 07/306,377
Ether sulfonates as antistatic agents
Inventors:
Rudolf Veitenhansl, Wolfgang Froeschke, Robert Piorr
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Feb 3, 1989
Inventors
Rudolf Veitenhansl
Wolfgang Froeschke
Robert Piorr
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.