Granted Patent
Utility
US 4,436,852 · App. 06/438,445
Process for the coloration of linear polyesters in the melt with perylenetetracarboxylic acid bis-methylimide
Inventor:
Fridolin Babler
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: Nov 2, 1982
Inventor
Fridolin Babler
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.