Granted Patent
Utility
US 4,670,580 · App. 06/845,911
Process for preparing oligomeric glycol esters of dicarboxylic acids
Inventor:
Charles J. Maurer
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Mar 31, 1986
Inventor
Charles J. Maurer
Assignee (at issue)
Celanese GmbH
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.