Granted Patent
Utility
US 5,430,234 · App. 08/174,563
Process for removing phosphorus and heavy metals from phosphorus trichloride still bottoms residue
Inventors:
Terry W. Willis, Joseph H. Finley, Monte L. Uhrig, Harry M. Smith
Patented Case
View Patent ↗
Granted: Jul 4, 1995
Filed: Dec 28, 1993
Inventors
Terry W. Willis
Joseph H. Finley
Monte L. Uhrig
Harry M. Smith
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.