Granted Patent
Utility
US 4,912,255 · App. 07/338,001
Process for preparing sodium phenylpyruvate from calcium phenylpyruvate
Inventor:
Albert Sun-Chi Chan
Patented Case
View Patent ↗
Granted: Mar 27, 1990
Filed: Apr 13, 1989
Inventor
Albert Sun-Chi Chan
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.