Granted Patent
Utility
US 4,475,447 · App. 06/462,054
Spray booth apparatus
Inventors:
Erhard Kock, Leo Zielinski
Patented Case
View Patent ↗
Granted: Oct 9, 1984
Filed: Jan 28, 1983
Inventors
Erhard Kock
Leo Zielinski
Assignee (at issue)
Champion Spark Plug 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.