Granted Patent
Utility
US 4,948,920 · App. 07/328,410
Process for the preparation of phenylpyruvic acid from benzyl chloride
Inventors:
Clark R. Landis, Hayat Khowaja
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: Mar 24, 1989
Inventors
Clark R. Landis
Hayat Khowaja
Assignee (at issue)
The NutraSweet Company
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.