Granted Patent
Utility
US 4,229,409 · App. 05/956,897
Method of inhibiting corrosion of aluminum with 2-phosphono-butane-1,2,4-tricarboxylic acid
Inventors:
Rolf Scharf, Hans-Joachim Schlussler, Friedrich Staschkiewicz
Patented Case
View Patent ↗
Granted: Oct 21, 1980
Filed: Nov 2, 1978
Inventors
Rolf Scharf
Hans-Joachim Schlussler
Friedrich Staschkiewicz
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien (Henkel KGAA)
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.