Granted Patent
Utility
US 4,427,722 · App. 06/393,700
Apparatus for applying a controlled layer of a saturant or a coating via a free-falling vertical curtain
Inventor:
Martin Keller
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Jun 30, 1982
Inventor
Martin Keller
Assignee (at issue)
Sandy Hill Corporation
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.