Granted Patent
Utility
US 4,845,183 · App. 07/124,634
Heat resistant polyamide and polybenzoxazole from bis-((amino-hydroxyphenyl)hexafluoroisopropyl)diphenyl ethers
Inventors:
Werner H. Mueller, Dinesh N. Khanna
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Nov 24, 1987
Inventors
Werner H. Mueller
Dinesh N. Khanna
Assignee (at issue)
Hoechst Celanese Corporation
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.