Granted Patent
Utility
US 5,392,728 · App. 08/092,708
Roadway markers with concave curved edges
Inventors:
Peter A. Speer, Michael W. Sly, Harry J. Glutting
Patented Case
View Patent ↗
Granted: Feb 28, 1995
Filed: Jul 15, 1993
Inventors
Peter A. Speer
Michael W. Sly
Harry J. Glutting
Assignee (at issue)
Davidson Plastics Corporation
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.