Granted Patent
Utility
US 4,313,919 · App. 06/169,078
Process for removing fine solids from phosphoric acid by vacuum filtration
Inventors:
Thomas E. Richards, James P. Harvey, Michael A. Daigle
Patented Case
View Patent ↗
Granted: Feb 2, 1982
Filed: Jul 15, 1980
Inventors
Thomas E. Richards
James P. Harvey
Michael A. Daigle
Assignee (at issue)
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.