Granted Patent
Utility
US 4,645,650 · App. 06/751,859
Obtaining aqueous solution from insoluble metal oxide
Inventors:
Derek John Fray, Herbert A. Hancock
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Jul 5, 1985
Inventors
Derek John Fray
Herbert A. Hancock
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.