Granted Patent
Utility
US 4,221,680 · App. 05/816,684
Treatment of substances
Inventors:
William H. Hardwick, Ronald Gayler
Patented Case
View Patent ↗
Granted: Sep 9, 1980
Filed: Jul 18, 1977
Inventors
William H. Hardwick
Ronald Gayler
Assignee (at issue)
United Kingdom Atomic Energy Authority
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.