Granted Patent
Utility
US 4,276,270 · App. 06/082,258
Start-up procedure in producing phosphoric acid by the hemihydrate process
Inventors:
F. Michael Gragg, James M. Self
Patented Case
View Patent ↗
Granted: Jun 30, 1981
Filed: Oct 5, 1979
Inventors
F. Michael Gragg
James M. Self
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.