Granted Patent
Utility
US 5,217,140 · App. 07/914,054
Tank construction and method of manufacture
Inventor:
John R. Lindahl
Patented Case
View Patent ↗
Granted: Jun 8, 1993
Filed: Jul 13, 1992
Inventor
John R. Lindahl
Assignee (at issue)
State 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.