Granted Patent
Utility
US 4,427,082 · App. 06/346,970
Mining drill
Inventors:
Vinod K. Sarin, Peter Oberhauser
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Feb 8, 1982
Inventors
Vinod K. Sarin
Peter Oberhauser
Assignee (at issue)
GTE Laboratories Incorporated
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.