Granted Patent
Utility
US 4,113,756 · App. 05/740,147
Conversion of mono-valent thallium to tri-valent thallium
Inventor:
Richard A. Johnson
Patented Case
View Patent ↗
Granted: Sep 12, 1978
Filed: Nov 8, 1976
Inventor
Richard A. Johnson
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.