Granted Patent
Utility
US 4,539,836 · App. 06/516,872
Package leak tester
Inventors:
Benny L. Hester, William H. Graves, Jr.
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Jul 25, 1983
Inventors
Benny L. Hester
William H. Graves, Jr.
Assignee (at issue)
R.J. Reynolds Tobacco 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.