Granted Patent
Utility
US 4,952,425 · App. 07/212,286
Method of preparing high purity dopant alloys
Inventors:
Robert H. Allen, Jameel Ibrahim
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Jun 27, 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.