Granted Patent
Utility
US 4,869,893 · App. 07/083,139
Preparation of high purity compounds of sulfur, selenium, and tellurium
Inventors:
Ricardo C. Pastor, Luisa E. Gorre
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Aug 10, 1987
Inventors
Ricardo C. Pastor
Luisa E. Gorre
Assignee (at issue)
Hughes Aircraft Company
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.