Granted Patent
Utility
US 4,258,008 · App. 05/866,989
System for phosphoric acid production with decreased foaming
Inventors:
Fredrick M. Gragg, John D. Ellis, Allen S. Adams
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Jan 5, 1978
Inventors
Fredrick M. Gragg
John D. Ellis
Allen S. Adams
Assignees (at issue)
Occidental Research Corporation
Occidental Chemical Corporation
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.