Granted Patent
Utility
US 6,477,890 · App. 09/662,914
Smoke-producing apparatus for detecting leaks
Inventor:
Jon L. Hulsebus
Patented Case
View Patent ↗
Granted: Nov 12, 2002
Filed: Sep 15, 2000
Inventor
Jon L. Hulsebus
Assignee (at issue)
K-LINE INDUSTRIES, 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.