Granted Patent
Utility
US 6,284,834 · App. 09/317,248
Aqueous preparation treatment of mineral building materials
Inventors:
Stephan Kirchmeyer, Markus Mechtel, Karl-Heinz Kasler
Patented Case
View Patent ↗
Granted: Sep 4, 2001
Filed: May 24, 1999
Inventors
Stephan Kirchmeyer
Markus Mechtel
Karl-Heinz Kasler
Assignee (at issue)
Bayer Aktiengesellschaft
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.