Granted Patent
Utility
US 5,304,708 · App. 07/913,265
Alloying metal hydroxide sludge waste into a glass material
Inventor:
Marvin L. Buehler
Patented Case
View Patent ↗
Granted: Apr 19, 1994
Filed: Jul 14, 1992
Inventor
Marvin L. Buehler
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.