Granted Patent
Utility
US 5,821,373 · App. 08/712,722
Solid sloutions of 1,4-diketopyrrolopyrroles
Inventors:
Zhimin Hao, Olof Wallquist
Patented Case
View Patent ↗
Granted: Oct 13, 1998
Filed: Sep 12, 1996
Inventors
Zhimin Hao
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.