Granted Patent
Utility
US 4,872,051 · App. 07/103,202
Collision avoidance alarm system
Inventor:
Robert Dye
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Oct 1, 1987
Inventor
Robert Dye
Assignee (at issue)
Environmental Research Institute
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.