Granted Patent
Utility
US 4,229,780 · App. 05/919,662
Fluorescent lamp for use in explosive atmospheres such as mines
Inventor:
Robert C. Nelson
Patented Case
View Patent ↗
Granted: Oct 21, 1980
Filed: Jun 27, 1978
Inventor
Robert C. Nelson
Assignee (at issue)
West Virginia Armature 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.