Granted Patent
Utility
US 5,693,824 · App. 08/712,721
Preparation of mixed crystals and solid solutions of 1, 4-diketo-pyrrolpyrroles
Inventors:
Jin Mizuguchi, Zhimin Hao, Olof Wallquist, Abul Iqbal
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Sep 12, 1996
Inventors
Jin Mizuguchi
Zhimin Hao
Olof Wallquist
Abul Iqbal
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.