Granted Patent
Utility
US 5,708,188 · App. 08/535,438
Mixed crystals and solid solution of 1,4-diketopyrrolopyrroles
Inventors:
Zhimin Hao, Abul Iqbal, Bernhard Medinger, Olof Wallquist
Patented Case
View Patent ↗
Granted: Jan 13, 1998
Filed: Sep 28, 1995
Inventors
Zhimin Hao
Abul Iqbal
Bernhard Medinger
Olof Wallquist
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.