Granted Patent
Utility
US 4,269,721 · App. 06/106,322
Dust abatement with calcium sulfate
Inventors:
Klaus Mueller, Norman R. Olsen
Patented Case
View Patent ↗
Granted: May 26, 1981
Filed: Dec 21, 1979
Inventors
Klaus Mueller
Norman R. Olsen
Assignee (at issue)
Stauffer Chemical 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.