Granted Patent
Utility
US 4,683,071 · App. 06/788,690
Benzotriazole mixtures, processes for producing them, and their use as metal passivators
Inventors:
Franz Regenass, Peter Collen Hamblin
Patented Case
View Patent ↗
Granted: Jul 28, 1987
Filed: Oct 18, 1985
Inventors
Franz Regenass
Peter Collen Hamblin
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.