Granted Patent
Utility
US 5,542,975 · App. 08/493,080
.beta.-crystal form of 4,4'-Diamino-3,3'-Dibromo-1,1'-Dianthraquinonyl
Inventor:
Peter Bitterli
Patented Case
View Patent ↗
Granted: Aug 6, 1996
Filed: Jun 21, 1995
Inventor
Peter Bitterli
Assignee (at issue)
Clariant Finance (BVI) Limited
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.