Granted Patent
Utility
US 4,244,939 · App. 05/914,458
Barbituric acid tracers and their preparation
Inventors:
George Henry Parsons, Ernest V. Groman
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Jun 12, 1978
Inventors
George Henry Parsons
Ernest V. Groman
Assignee (at issue)
Baxter Travenol Laboratories, Inc.
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.