Granted Patent
Utility
US 5,091,520 · App. 07/578,060
Finely particulate cellulose esters of aromatic or aromatic-aliphatic carboxylic acids, process for their preparation, and the use thereof
Inventors:
Eric Francotte, Gabriele Baisch
Patented Case
View Patent ↗
Granted: Feb 25, 1992
Filed: Sep 5, 1990
Inventors
Eric Francotte
Gabriele Baisch
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.