Granted Patent
Utility
US 4,557,921 · App. 06/625,355
Purification of halide
Inventors:
Warren B. Kirsch, Sebastian M. Laurent
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Jun 27, 1984
Inventors
Warren B. Kirsch
Sebastian M. Laurent
Assignee (at issue)
Ethyl Corporation
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.