Granted Patent
Utility
US 4,814,151 · App. 07/077,577
Soda ash manufacture
Inventor:
Alan Henry Benke
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Jul 23, 1987
Inventor
Alan Henry Benke
Assignee (at issue)
Stauffer Chemical 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.