Granted Patent
Utility
US 4,679,657 · App. 06/821,805
Mobile tank vehicle access system
Inventors:
Ronald W. Bennett, Ellie H. MacDonald
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: Jan 23, 1986
Inventors
Ronald W. Bennett
Ellie H. MacDonald
Assignee (at issue)
Aluminum Ladder 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.