Granted Patent
Utility
US 4,521,392 · App. 06/475,275
Process for blending phosphoric acids of differing impurity content
Inventors:
Harold E. Mills, David L. Murdock, Richard M. Ramer, Francis M. Sale
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Mar 14, 1983
Inventors
Harold E. Mills
David L. Murdock
Richard M. Ramer
Francis M. Sale
Assignee (at issue)
Occidental Chemical Agricultural Products, Inc.
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.