Granted Patent
Utility
US 4,567,247 · App. 06/611,299
Process for forming thermally stable thermotropic liquid crystalline polyesters of predetermined chain length utilizing aromatic hydroxyl monomer and/or aromatic amine monomer
Inventor:
Hyun-Nam Yoon
Patented Case
View Patent ↗
Granted: Jan 28, 1986
Filed: May 17, 1984
Inventor
Hyun-Nam Yoon
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.