Granted Patent
Utility
US 4,510,049 · App. 06/535,521
Process for recovery of colemanite and probertite from mixed low grade ore
Inventors:
Anh Mai, Donald J. Kaczynski, Lawrence W. Trainor, deceased
Patented Case
View Patent ↗
Granted: Apr 9, 1985
Filed: Sep 26, 1983
Inventors
Anh Mai
Donald J. Kaczynski
Lawrence W. Trainor, deceased
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.