Granted Patent
Utility
US 4,676,963 · App. 06/861,163
Manufacture of sodium tripolyphosphate from wet acid
Inventor:
Nirmal K. Khanna
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: May 9, 1986
Inventor
Nirmal K. Khanna
Assignee (at issue)
FMC 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.