Granted Patent
Utility
US 4,637,921 · App. 06/726,351
Process for producing ammonium polyphosphate
Inventors:
James E. Sansing, Byron M. McCarver
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Apr 19, 1985
Inventors
James E. Sansing
Byron M. McCarver
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.