Granted Patent
Utility
US 4,558,657 · App. 06/168,756
Spraying apparatus
Inventor:
Walter Rohrbach
Patented Case
View Patent ↗
Granted: Dec 17, 1985
Filed: Jul 11, 1980
Inventor
Walter Rohrbach
Assignee (at issue)
Mid-West Automation, 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.