Granted Patent
Utility
US 6,689,207 · App. 10/200,146
Method and plant for making alumina cement and alumina cement
Inventors:
Bruno Espinosa, Thomas Bier
Patented Case
View Patent ↗
Granted: Feb 10, 2004
Filed: Jul 23, 2002
Inventors
Bruno Espinosa
Thomas Bier
Assignee (at issue)
Lafarge Aluminates
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.