Granted Patent
Utility
US 4,489,367 · App. 06/532,872
Headlight permissible for use in explosive atmospheres
Inventors:
Charles R. Herron, Marvin L. Haines, Roger L. O'Quinn
Patented Case
View Patent ↗
Granted: Dec 18, 1984
Filed: Sep 16, 1983
Inventors
Charles R. Herron
Marvin L. Haines
Roger L. O'Quinn
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.