Granted Patent
Utility
US 4,982,036 · App. 07/410,219
Transfer of acid catalyst
Inventors:
Henry K. Hachmuth, Keith W. Hovis
Patented Case
View Patent ↗
Granted: Jan 1, 1991
Filed: Sep 21, 1989
Inventors
Henry K. Hachmuth
Keith W. Hovis
Assignee (at issue)
Phillips Petroleum 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.