Granted Patent
Utility
US 4,284,435 · App. 06/098,156
Method for spray cleaning painted surfaces
Inventor:
Derek J. Fox
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Nov 28, 1979
Inventor
Derek J. Fox
Assignee (at issue)
S. C. JOHNSON & SON, 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.