Granted Patent
Utility
US 4,147,756 · App. 05/675,364
Combustion gas scrubbing system
Inventors:
Donald A. Dahlstrom, William Frank Ellison, James H. Wilhelm
Patented Case
View Patent ↗
Granted: Apr 3, 1979
Filed: Apr 9, 1976
Inventors
Donald A. Dahlstrom
William Frank Ellison
James H. Wilhelm
Assignee (at issue)
Envirotech, Inc.
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.