Granted Patent
Utility
US 4,692,505 · App. 06/888,809
Process for preparing oxymethylene polymers using boron trifluoride in admixture with an inert gas
Inventors:
Clifford R. Boldt, Richard K. Greene
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: Jul 22, 1986
Inventors
Clifford R. Boldt
Richard K. Greene
Assignee (at issue)
Celanese Engineering Resins, Inc.
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.