Granted Patent
Utility
US 5,540,331 · App. 08/366,869
Leak proof vial for microscope slides
Inventor:
Johnson N. S. Wong
Patented Case
View Patent ↗
Granted: Jul 30, 1996
Filed: Dec 30, 1994
Inventor
Johnson N. S. Wong
Assignee (at issue)
Evergreen 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.