Granted Patent
Utility
US 4,997,989 · App. 07/293,447
Tert-butylalkynols
Inventors:
Hubert Smuda, Wolfgang Rohr
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Jan 4, 1989
Inventors
Hubert Smuda
Wolfgang Rohr
Assignee (at issue)
BASF SE
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.