Granted Patent
Utility
US 6,176,905 · App. 09/263,315
Process and reaction solution for producing a patina
Inventors:
Sonja Priggemeyer, Stefan Priggemeyer, Stefan Hoveling
Patented Case
View Patent ↗
Granted: Jan 23, 2001
Filed: Mar 5, 1999
Inventors
Sonja Priggemeyer
Stefan Priggemeyer
Stefan Hoveling
Assignee (at issue)
KM Europa Metal Aktiengesellschaft
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.