Granted Patent
Utility
US 4,872,915 · App. 07/022,617
Orthorhombic lead chromate pigments of greenish hue
Inventors:
Leonardus Johannes Hubertus Erkens, Gerben P. Algra, Jacobus-Michiel-Hubertus Snijders, Herman J. J. M. Geurts, Andre Pugin
Patented Case
View Patent ↗
Granted: Oct 10, 1989
Filed: Mar 3, 1987
Inventors
Leonardus Johannes Hubertus Erkens
Gerben P. Algra
Jacobus-Michiel-Hubertus Snijders
Herman J. J. M. Geurts
Andre Pugin
Assignee (at issue)
Ciba-Geigy
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.