Granted Patent
Utility
US 4,781,843 · App. 07/131,902
Chemical treatment for algae control in open water systems
Inventors:
Gary L. Baker, Ronald J. Christensen
Patented Case
View Patent ↗
Granted: Nov 1, 1988
Filed: Dec 11, 1987
Inventors
Gary L. Baker
Ronald J. Christensen
Assignee (at issue)
Dubois Chemicals, 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.