Granted Patent
Utility
US 5,013,604 · App. 07/255,446
Preparation of high purity boron
Inventors:
Robert H. Allen, Jameel Ibrahim
Patented Case
View Patent ↗
Granted: May 7, 1991
Filed: Oct 11, 1988
Inventors
Robert H. Allen
Jameel Ibrahim
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.