Granted Patent
Utility
US 4,613,849 · App. 06/603,258
Interference warning device
Inventors:
Roger D. Smith, Joseph R. Priest, Faustyn C. Langowski, Harry D. Hebard
Patented Case
View Patent ↗
Granted: Sep 23, 1986
Filed: Apr 23, 1984
Inventors
Roger D. Smith
Joseph R. Priest
Faustyn C. Langowski
Harry D. Hebard
Assignee (at issue)
Hughes Tool Company LLC
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.