Granted Patent
Utility
US 4,115,421 · App. 05/740,144
Process for converting thallium (I) to thallium (III)
Inventor:
William F. Brill
Patented Case
View Patent ↗
Granted: Sep 19, 1978
Filed: Nov 8, 1976
Inventor
William F. Brill
Assignee (at issue)
Halcon International, 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.