Granted Patent
Utility
US 4,984,523 · App. 07/281,192
Self-propelled trolley and supporting track structure
Inventors:
Clarence A. Dehne, Daniel S. Ellens
Patented Case
View Patent ↗
Granted: Jan 15, 1991
Filed: Dec 7, 1988
Inventors
Clarence A. Dehne
Daniel S. Ellens
Assignee (at issue)
JERVIS B. WEBB 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.