Granted Patent
Utility
US 4,515,230 · App. 06/642,886
Roof drill bit
Inventors:
Thomas C. Means, Kenneth C. Emmerich
Patented Case
View Patent ↗
Granted: May 7, 1985
Filed: Aug 21, 1984
Inventors
Thomas C. Means
Kenneth C. Emmerich
Assignee (at issue)
Fansteel Inc.
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.