Granted Patent
Utility
US 5,032,371 · App. 07/376,572
Process for the continuous recovery of hydrogen fluoride gas
Inventor:
Henry J. Buehler
Patented Case
View Patent ↗
Granted: Jul 16, 1991
Filed: Jul 7, 1989
Inventor
Henry J. Buehler
Assignee (at issue)
Mallinckrodt Specialty Chemicals Company
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.