Granted Patent
Utility
US 5,371,052 · App. 08/136,341
Process for recovering boron trifluoride
Inventors:
Tatsuya Kawamura, Makoto Akatsu, Hiroyasu Ishimoto
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: Oct 14, 1993
Inventors
Tatsuya Kawamura
Makoto Akatsu
Hiroyasu Ishimoto
Assignee (at issue)
Idemitsu Petrochemical Co., Ltd.
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.